Difference between revisions of "Geogebra/C2/Symmetrical-Transformation-in-Geogebra/English-timed"
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!'''Narration''' | !'''Narration''' | ||
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|- | |- | ||
− | |00:00 | + | |00:00 |
− | | | + | |Hello everybody. Welcome to this tutorial on '''Symmetrical Transformation''' in '''Geogebra'''. |
|- | |- | ||
− | |00:06 | + | |00:06 |
− | | | + | |In this tutorial we will learn Symmetrical transformations such as: |
|- | |- | ||
− | |00:11 | + | |00:11 |
− | | | + | |* Line symmetry |
|- | |- | ||
− | |00:12 | + | |00:12 |
− | | | + | |* Rotation symmetry |
|- | |- | ||
− | |00:13 | + | |00:13 |
− | | | + | |* and also learn to enlarge figure with scale and position. |
|- | |- | ||
− | |00:17 | + | |00:17 |
− | | | + | |We assume that you have the basic working knowledge of Geogebra. |
|- | |- | ||
− | |00:21 | + | |00:21 |
− | | | + | |If not, for relevant tutorials, please visit our website. |
|- | |- | ||
− | |00:26 | + | |00:26 |
− | | | + | |To record this tutorial, I am using '''Ubuntu Linux OS Version 11.10''', |
|- | |- | ||
− | |00:31 | + | |00:31 |
− | | | + | |'''Geogebra Version 3.2.47.0'''. |
|- | |- | ||
− | |00:35 | + | |00:35 |
− | | | + | |We will use the following Geogebra tools: |
|- | |- | ||
− | |00:37 | + | |00:37 |
− | | Reflect Object about Line | + | |* Reflect Object about Line |
|- | |- | ||
− | |00:39 | + | |00:39 |
− | | Rotate Object around Point by Angle | + | |* Rotate Object around Point by Angle |
|- | |- | ||
− | |00:42 | + | |00:42 |
− | | Dilate object from a Point by Factor | + | |* Dilate object from a Point by Factor |
|- | |- | ||
− | |00:45 | + | |00:45 |
− | | Semicircle through Two points | + | |* Semicircle through Two points |
|- | |- | ||
− | |00:47 | + | |00:47 |
− | | Regular Polygon and | + | |* Regular Polygon and |
|- | |- | ||
− | |00:49 | + | |00:49 |
− | | Perpendicular bisector | + | |* Perpendicular bisector |
|- | |- | ||
− | |00:51 | + | |00:51 |
− | | | + | |Definition of '''Transformation'''- |
|- | |- | ||
− | |00:53 | + | |00:53 |
− | | | + | |Symmetrical transformation of a geometric figure is: |
|- | |- | ||
− | |00:57 | + | |00:57 |
− | | | + | | A change in its position, size or shape on a coordinate plane. |
|- | |- | ||
− | |01:02 | + | |01:02 |
− | | | + | | Original figure is called '''Object'''. |
|- | |- | ||
− | |01:04 | + | |01:04 |
− | | | + | | Transformed figure is called '''Image'''. |
|- | |- | ||
− | |01:07 | + | |01:07 |
− | | | + | |'''Reflection symmetry''': |
|- | |- | ||
− | |01:09 | + | |01:09 |
− | | | + | |* Is also called as '''Line symmetry'''. |
|- | |- | ||
− | |01:11 | + | |01:11 |
− | | | + | |* A type of symmetry where one half is the reflection of the other half. |
|- | |- | ||
− | |01:15 | + | |01:15 |
− | | | + | |* You could fold the image and have both halves match exactly. |
|- | |- | ||
− | |01:20 | + | |01:20 |
− | | | + | |* Line of Symmetry is the line over which the figure is reflected. |
|- | |- | ||
− | |01:24 | + | |01:24 |
− | | | + | |Let's switch to Geogebra window. |
|- | |- | ||
− | |01:27 | + | |01:27 |
− | | Dash home >>Media Apps>>Type | + | |Look on '''Dash home''' >> '''Media Apps''' >> under '''Type''' >> choose '''Education''' >> and '''Geogebra'''. |
|- | |- | ||
− | |01:37 | + | |01:37 |
− | | | + | |For this tutorial, I am closing the '''Algebric view'''. |
|- | |- | ||
− | |01:40 | + | |01:40 |
− | | | + | |Click on Close button on '''Algebric view'''. |
|- | |- | ||
− | |01:47 | + | |01:47 |
− | | | + | |Let's start with '''Line of symmetry'''. |
|- | |- | ||
− | |01:50 | + | |01:50 |
− | | | + | |First, let's construct an equilateral triangle. |
|- | |- | ||
− | |01:53 | + | |01:53 |
− | | | + | |Select '''Regular Polygon''' tool from the toolbar. |
|- | |- | ||
− | |01:57 | + | |01:57 |
− | | | + | |Click on drawing pad points '''A''' ,'''B''', and enter 3 for the number of sides. |
|- | |- | ||
− | |02:08 | + | |02:08 |
− | | | + | |An equilateral triangle '''ABC''' is drawn. |
|- | |- | ||
− | |02:11 | + | |02:11 |
− | | | + | |Let's draw a perpendicular bisector to one of the sides of triangle. |
|- | |- | ||
− | |02:15 | + | |02:15 |
− | | | + | |Select '''Perpendicular Bisector Tool''' and click on side AC. |
|- | |- | ||
− | |02:26 | + | |02:26 |
− | | Point | + | |Select the '''Point''' tool and create a point inside the triangle. |
|- | |- | ||
− | |02:31 | + | |02:31 |
− | | | + | |Move the point D towards one of the vertices . |
|- | |- | ||
− | |02:38 | + | |02:38 |
− | | | + | |Right click on point D and select '''Trace On'''. |
|- | |- | ||
− | |02:43 | + | |02:43 |
− | | | + | |Select '''Reflect Object about Line''' tool from the tool bar. |
|- | |- | ||
− | |02:48 | + | |02:48 |
− | | | + | |Click on the point D. |
|- | |- | ||
− | |02:49 | + | |02:49 |
− | | | + | |This will highlight point D. |
|- | |- | ||
− | |02:52 | + | |02:52 |
− | | | + | |Click on '''Perpendicular Bisector'''. |
|- | |- | ||
− | |02:55 | + | |02:55 |
− | | | + | |This will produce reflected image D' on the other side of perpendicular bisector. |
|- | |- | ||
− | |03:01 | + | |03:01 |
− | | | + | |'''D' '''is mirror image of point '''D'''. |
|- | |- | ||
− | |03:04 | + | |03:04 |
− | | | + | |Set '''Trace On''' for the point '''D'''. |
− | + | ||
|- | |- | ||
− | |03:08 | + | |03:08 |
− | | | + | |Let us move the point D along the triangle, using '''Move''' tool. |
|- | |- | ||
− | |03:11 | + | |03:11 |
− | | | + | |Click on the first option under '''Move''' tool from the toolbar. |
|- | |- | ||
− | |03:22 | + | |03:22 |
− | | | + | |Click on figure with the mouse. |
|- | |- | ||
− | |03:25 | + | |03:25 |
− | | | + | |Drag it tracing the triangle . |
|- | |- | ||
− | |03:28 | + | |03:28 |
− | | | + | |Now release the mouse button. |
|- | |- | ||
− | |03:31 | + | |03:31 |
− | | | + | |What do you notice ? |
|- | |- | ||
− | |03:32 | + | |03:32 |
− | | | + | |Here perpendicular bisector is the line of symmetry. |
|- | |- | ||
− | |03:36 | + | |03:36 |
− | | D | + | |'''D''' is the object and '''D' '''is the image. |
− | + | ||
|- | |- | ||
− | |03:39 | + | |03:39 |
− | | | + | |Let's reflect a semicircle about a line. |
|- | |- | ||
− | |03:43 | + | |03:43 |
− | | | + | |Let's draw a semicircle. |
|- | |- | ||
− | |03:44 | + | |03:44 |
− | | | + | |Click on the '''Semicircle through Two points''' tool. Mark point E and then F. |
|- | |- | ||
− | |03:56 | + | |03:56 |
− | | segment | + | |Click on segment between two points. |
|- | |- | ||
− | |04:02 | + | |04:02 |
− | | | + | |Mark points G and H. A line is drawn. |
|- | |- | ||
− | |04:06 | + | |04:06 |
− | | | + | |Let's change the property of the line. |
|- | |- | ||
− | |04:08 | + | |04:08 |
− | | | + | |Right click on the line, '''Object Properties'''. Click on '''Style''', change Style. |
|- | |- | ||
− | |04:21 | + | |04:21 |
− | | | + | |Select '''Reflect Object about Line''' tool from the toolbar. |
|- | |- | ||
− | |04:27 | + | |04:27 |
− | | | + | |Click on the semicircle EF. |
|- | |- | ||
− | |04:31 | + | |04:31 |
− | | | + | |Click on line GH. |
|- | |- | ||
− | |04:34 | + | |04:34 |
− | | | + | |This will produce the reflected image E'F' on the other side of line GH. What does the figure look like now ? It looks like a circle. |
|- | |- | ||
− | |04:45 | + | |04:45 |
− | | | + | |Let us save this file now. |
|- | |- | ||
− | |04:47 | + | |04:47 |
− | | | + | |Click on '''File''' >> '''Save As'''. |
|- | |- | ||
− | |04:50 | + | |04:50 |
− | | | + | |I will type the file name as '''Line-symmetry''' and click on '''Save'''. |
− | + | ||
|- | |- | ||
− | |05:05 | + | |05:05 |
− | | | + | |Next, let us learn to '''Rotate the Object around a Point by Angle'''. |
|- | |- | ||
− | |05:12 | + | |05:12 |
− | | | + | |Definition of Rotation- |
|- | |- | ||
− | |05:15 | + | |05:15 |
− | | | + | |A rotation is a transformation that turns a figure around a fixed center by an angle. |
|- | |- | ||
− | |05:21 | + | |05:21 |
− | | | + | |If the figure appears unchanged then the figure has rotation symmetry. |
|- | |- | ||
− | |05:29 | + | |05:29 |
− | | | + | |You can rotate object at any degree measure. Rotation can be clockwise and counterclockwise. |
|- | |- | ||
− | |05:39 | + | |05:39 |
− | | | + | |Let's open a new Geogebra window. |
|- | |- | ||
− | |05:41 | + | |05:41 |
− | | | + | |click on '''File''' >> '''New'''. |
|- | |- | ||
− | |05:47 | + | |05:47 |
− | | | + | |Let us construct a square. |
− | + | ||
|- | |- | ||
− | |05:49 | + | |05:49 |
− | | | + | |click on '''Regular Polygon''' tool from the toolbar. |
|- | |- | ||
− | |05:55 | + | |05:55 |
− | | | + | |Click on the drawing pad. |
|- | |- | ||
− | |05:57 | + | |05:57 |
− | | | + | |Mark points '''A''' and '''B'''. |
|- | |- | ||
− | |05:59 | + | |05:59 |
− | | | + | |A dialog box opens. |
|- | |- | ||
− | |06:01 | + | |06:01 |
− | | OK | + | |Click on '''OK'''. |
|- | |- | ||
− | |06:03 | + | |06:03 |
− | | | + | |A square '''ABCD''' is drawn. |
|- | |- | ||
− | |06:05 | + | |06:05 |
− | | | + | |Click on '''Rotate Object around a Point by Angle''' tool. |
|- | |- | ||
− | |06:13 | + | |06:13 |
− | | | + | |Click on the Square '''ABCD'''. |
|- | |- | ||
− | |06:16 | + | |06:16 |
− | | | + | |This will highlight the square. |
|- | |- | ||
− | |06:18 | + | |06:18 |
− | | | + | |Next Click on any one of the vertices. |
|- | |- | ||
− | |06:20 | + | |06:20 |
− | | | + | |I will click on '''A'''. |
|- | |- | ||
− | |06:23 | + | |06:23 |
− | | | + | |A dialog box opens. |
|- | |- | ||
− | |06:25 | + | |06:25 |
− | | | + | |Type '''60''' in the '''Angle''' field |
|- | |- | ||
− | |06:30 | + | |06:30 |
− | | | + | |Select '''°'''(Degree) from first drop down list. |
|- | |- | ||
− | |06:35 | + | |06:35 |
− | | | + | |Select the option '''clockwise'''. Click on '''OK'''. |
|- | |- | ||
− | |06:40 | + | |06:40 |
− | | | + | |This will rotate the square clockwise at the point of selection, with the angle of 60°. |
|- | |- | ||
− | |06:44 | + | |06:44 |
− | | | + | |The rotated image '''A`B`C`D`''' is formed. |
− | + | ||
|- | |- | ||
− | |06:49 | + | |06:49 |
− | | Move | + | |Let's move this figure aside using '''Move''' tool. |
|- | |- | ||
− | |07:00 | + | |07:00 |
− | | | + | |Next, let's '''dilate''' or '''enlarge object from point by factor.''' |
|- | |- | ||
− | |07:09 | + | |07:09 |
− | | | + | |'''Dilation''': |
|- | |- | ||
− | |07:11 | + | |07:11 |
− | | | + | |Dilation or enlargement is a transformation |
|- | |- | ||
− | |07:14 | + | |07:14 |
− | | | + | |in which a figure is enlarged using a scale factor. |
|- | |- | ||
− | |07:23 | + | |07:23 |
− | | | + | |Let's draw a triangle using the '''Polygon'''tool, |
|- | |- | ||
− | |07:28 | + | |07:28 |
− | | E, F, G | + | |E , F , G. Click on E again to complete the triangle. |
|- | |- | ||
− | |07:36 | + | |07:36 |
− | | New Point | + | |Click on '''New Point''' tool and |
|- | |- | ||
− | |07:40 | + | |07:40 |
− | | | + | |mark a point '''H'''. |
|- | |- | ||
− | |07:44 | + | |07:44 |
− | | | + | |Click on '''Dilate Object from Point by Factor''' tool. |
|- | |- | ||
− | |07:51 | + | |07:51 |
− | | | + | |Click on the triangle '''EFG'''. |
|- | |- | ||
− | |07:54 | + | |07:54 |
− | | | + | |This will highlight the triangle. |
|- | |- | ||
− | |07:55 | + | |07:55 |
− | | | + | |Click on the point 'H'. |
|- | |- | ||
− | |07:57 | + | |07:57 |
− | | | + | |A dialog box opens. |
|- | |- | ||
− | |08:00 | + | |08:00 |
− | | | + | |Type value of 2 in the number field. |
|- | |- | ||
− | |08:04 | + | |08:04 |
− | | OK | + | |Click on '''OK'''. |
− | + | ||
|- | |- | ||
− | |08:09 | + | |08:09 |
− | | | + | |This will dilate or enlarge the object twice. |
|- | |- | ||
− | |08:16 | + | |08:16 |
− | | | + | |Click on segment between two Points, join points H,E,E'. |
|- | |- | ||
− | |08:33 | + | |08:33 |
− | | | + | |join points H,G,G'. |
|- | |- | ||
− | |09:01 | + | |09:01 |
− | | | + | |join points H,F,F'. |
− | + | ||
|- | |- | ||
− | |09:15 | + | |09:15 |
− | | | + | |Here, you can see that H is the point of dilation. |
|- | |- | ||
− | |09:21 | + | |09:21 |
− | | | + | |You can enlarge object as many number of times as you wish, by typing the value of '''Factor'''. |
|- | |- | ||
− | |09:28 | + | |09:28 |
− | | | + | |Let us save this file now. |
|- | |- | ||
− | |09:30 | + | |09:30 |
− | | | + | |Click on '''File''' >> '''Save As'''. |
|- | |- | ||
− | |09:33 | + | |09:33 |
− | | | + | |I will type the file name as '''Dilate-triangle'''. |
|- | |- | ||
− | |09:48 | + | |09:48 |
− | | | + | |Click on '''Save'''. With this we come to the end of this tutorial. |
|- | |- | ||
− | |09:55 | + | |09:55 |
− | | | + | |Let's summarize. |
|- | |- | ||
− | |09:58 | + | |09:58 |
− | | | + | |In this tutorial we learnt: |
|- | |- | ||
− | |10:00 | + | |10:00 |
− | | | + | |* Reflection about a line. |
|- | |- | ||
− | |10:02 | + | |10:02 |
− | | | + | |* Rotation of an object at a point. |
|- | |- | ||
− | |10:05 | + | |10:05 |
− | | | + | |* Enlargement of an object by a scale factor. |
|- | |- | ||
− | |10:09 | + | |10:09 |
− | | | + | |As an assignment I would like you to: |
|- | |- | ||
− | |10:11 | + | |10:11 |
− | | | + | |Draw a pentagon. |
|- | |- | ||
− | |10:12 | + | |10:12 |
− | | | + | |Use '''Regular Polygon''' tool to draw. (Hint:sides=5). |
|- | |- | ||
− | |10:17 | + | |10:17 |
− | | | + | |Draw a perpendicular bisector to one of the sides of the pentagon. |
|- | |- | ||
− | |10:21 | + | |10:21 |
− | | | + | |Create a point inside the pentagon. |
|- | |- | ||
− | |10:25 | + | |10:25 |
− | | | + | |Set '''Trace On''' for the point. |
|- | |- | ||
− | |10:27 | + | |10:27 |
− | | | + | |Get reflection of the point about the perpendicular bisector. |
|- | |- | ||
− | |10:31 | + | |10:31 |
− | | | + | |Set '''Trace On''' for the image point. |
|- | |- | ||
− | |10:34 | + | |10:34 |
− | | | + | |Trace the pentagon to see if you have selected the correct line of symmetry. |
|- | |- | ||
− | |10:44 | + | |10:44 |
− | | | + | |Rotate the original pentagon counter clockwise in 135° at a point. |
|- | |- | ||
− | |10:49 | + | |10:49 |
− | | | + | |Dilate the pentagon at a point by the factor of 3. |
|- | |- | ||
− | |10:56 | + | |10:56 |
− | | | + | |The assignment should look like this. |
|- | |- | ||
− | |11:03 | + | |11:03 |
− | | | + | |Watch the video available at this URL. |
|- | |- | ||
− | |11:06 | + | |11:06 |
− | | | + | |It summarizes the Spoken Tutorial project. |
|- | |- | ||
− | |11:09 | + | |11:09 |
− | | | + | |If you do not have good bandwidth,you can download and watch it. |
− | + | ||
|- | |- | ||
− | |11:12 | + | |11:12 |
− | | | + | |The Spoken Tutorial Project Team : Conducts workshops using the spoken tutorials. |
|- | |- | ||
− | |11:17 | + | |11:17 |
− | | | + | |Gives certificates to those who pass an online test. |
|- | |- | ||
− | |11:20 | + | |11:20 |
− | | | + | |For more details, please write to contact@spoken-tutorial.org. |
|- | |- | ||
− | |11:26 | + | |11:26 |
− | | | + | |Spoken Tutorial Project is a part of the Talk to a Teacher project. |
|- | |- | ||
− | |11:29 | + | |11:29 |
− | | | + | |It is supported by the National Mission on Education through ICT, MHRD, Government of India. |
|- | |- | ||
− | |11:35 | + | |11:35 |
− | | | + | |More information on this Mission is available at this link. |
|- | |- | ||
− | |11:39 | + | |11:39 |
− | | | + | |This is Neeta Sawant from SNDT University Mumbai, signing off. |
+ | |||
+ | Thanks for joining. |
Revision as of 12:20, 6 August 2015
Time | Narration |
---|---|
00:00 | Hello everybody. Welcome to this tutorial on Symmetrical Transformation in Geogebra. |
00:06 | In this tutorial we will learn Symmetrical transformations such as: |
00:11 | * Line symmetry |
00:12 | * Rotation symmetry |
00:13 | * and also learn to enlarge figure with scale and position. |
00:17 | We assume that you have the basic working knowledge of Geogebra. |
00:21 | If not, for relevant tutorials, please visit our website. |
00:26 | To record this tutorial, I am using Ubuntu Linux OS Version 11.10, |
00:31 | Geogebra Version 3.2.47.0. |
00:35 | We will use the following Geogebra tools: |
00:37 | * Reflect Object about Line |
00:39 | * Rotate Object around Point by Angle |
00:42 | * Dilate object from a Point by Factor |
00:45 | * Semicircle through Two points |
00:47 | * Regular Polygon and |
00:49 | * Perpendicular bisector |
00:51 | Definition of Transformation- |
00:53 | Symmetrical transformation of a geometric figure is: |
00:57 | A change in its position, size or shape on a coordinate plane. |
01:02 | Original figure is called Object. |
01:04 | Transformed figure is called Image. |
01:07 | Reflection symmetry: |
01:09 | * Is also called as Line symmetry. |
01:11 | * A type of symmetry where one half is the reflection of the other half. |
01:15 | * You could fold the image and have both halves match exactly. |
01:20 | * Line of Symmetry is the line over which the figure is reflected. |
01:24 | Let's switch to Geogebra window. |
01:27 | Look on Dash home >> Media Apps >> under Type >> choose Education >> and Geogebra. |
01:37 | For this tutorial, I am closing the Algebric view. |
01:40 | Click on Close button on Algebric view. |
01:47 | Let's start with Line of symmetry. |
01:50 | First, let's construct an equilateral triangle. |
01:53 | Select Regular Polygon tool from the toolbar. |
01:57 | Click on drawing pad points A ,B, and enter 3 for the number of sides. |
02:08 | An equilateral triangle ABC is drawn. |
02:11 | Let's draw a perpendicular bisector to one of the sides of triangle. |
02:15 | Select Perpendicular Bisector Tool and click on side AC. |
02:26 | Select the Point tool and create a point inside the triangle. |
02:31 | Move the point D towards one of the vertices . |
02:38 | Right click on point D and select Trace On. |
02:43 | Select Reflect Object about Line tool from the tool bar. |
02:48 | Click on the point D. |
02:49 | This will highlight point D. |
02:52 | Click on Perpendicular Bisector. |
02:55 | This will produce reflected image D' on the other side of perpendicular bisector. |
03:01 | D' is mirror image of point D. |
03:04 | Set Trace On for the point D. |
03:08 | Let us move the point D along the triangle, using Move tool. |
03:11 | Click on the first option under Move tool from the toolbar. |
03:22 | Click on figure with the mouse. |
03:25 | Drag it tracing the triangle . |
03:28 | Now release the mouse button. |
03:31 | What do you notice ? |
03:32 | Here perpendicular bisector is the line of symmetry. |
03:36 | D is the object and D' is the image. |
03:39 | Let's reflect a semicircle about a line. |
03:43 | Let's draw a semicircle. |
03:44 | Click on the Semicircle through Two points tool. Mark point E and then F. |
03:56 | Click on segment between two points. |
04:02 | Mark points G and H. A line is drawn. |
04:06 | Let's change the property of the line. |
04:08 | Right click on the line, Object Properties. Click on Style, change Style. |
04:21 | Select Reflect Object about Line tool from the toolbar. |
04:27 | Click on the semicircle EF. |
04:31 | Click on line GH. |
04:34 | This will produce the reflected image E'F' on the other side of line GH. What does the figure look like now ? It looks like a circle. |
04:45 | Let us save this file now. |
04:47 | Click on File >> Save As. |
04:50 | I will type the file name as Line-symmetry and click on Save. |
05:05 | Next, let us learn to Rotate the Object around a Point by Angle. |
05:12 | Definition of Rotation- |
05:15 | A rotation is a transformation that turns a figure around a fixed center by an angle. |
05:21 | If the figure appears unchanged then the figure has rotation symmetry. |
05:29 | You can rotate object at any degree measure. Rotation can be clockwise and counterclockwise. |
05:39 | Let's open a new Geogebra window. |
05:41 | click on File >> New. |
05:47 | Let us construct a square. |
05:49 | click on Regular Polygon tool from the toolbar. |
05:55 | Click on the drawing pad. |
05:57 | Mark points A and B. |
05:59 | A dialog box opens. |
06:01 | Click on OK. |
06:03 | A square ABCD is drawn. |
06:05 | Click on Rotate Object around a Point by Angle tool. |
06:13 | Click on the Square ABCD. |
06:16 | This will highlight the square. |
06:18 | Next Click on any one of the vertices. |
06:20 | I will click on A. |
06:23 | A dialog box opens. |
06:25 | Type 60 in the Angle field |
06:30 | Select °(Degree) from first drop down list. |
06:35 | Select the option clockwise. Click on OK. |
06:40 | This will rotate the square clockwise at the point of selection, with the angle of 60°. |
06:44 | The rotated image A`B`C`D` is formed. |
06:49 | Let's move this figure aside using Move tool. |
07:00 | Next, let's dilate or enlarge object from point by factor. |
07:09 | Dilation: |
07:11 | Dilation or enlargement is a transformation |
07:14 | in which a figure is enlarged using a scale factor. |
07:23 | Let's draw a triangle using the Polygontool, |
07:28 | E , F , G. Click on E again to complete the triangle. |
07:36 | Click on New Point tool and |
07:40 | mark a point H. |
07:44 | Click on Dilate Object from Point by Factor tool. |
07:51 | Click on the triangle EFG. |
07:54 | This will highlight the triangle. |
07:55 | Click on the point 'H'. |
07:57 | A dialog box opens. |
08:00 | Type value of 2 in the number field. |
08:04 | Click on OK. |
08:09 | This will dilate or enlarge the object twice. |
08:16 | Click on segment between two Points, join points H,E,E'. |
08:33 | join points H,G,G'. |
09:01 | join points H,F,F'. |
09:15 | Here, you can see that H is the point of dilation. |
09:21 | You can enlarge object as many number of times as you wish, by typing the value of Factor. |
09:28 | Let us save this file now. |
09:30 | Click on File >> Save As. |
09:33 | I will type the file name as Dilate-triangle. |
09:48 | Click on Save. With this we come to the end of this tutorial. |
09:55 | Let's summarize. |
09:58 | In this tutorial we learnt: |
10:00 | * Reflection about a line. |
10:02 | * Rotation of an object at a point. |
10:05 | * Enlargement of an object by a scale factor. |
10:09 | As an assignment I would like you to: |
10:11 | Draw a pentagon. |
10:12 | Use Regular Polygon tool to draw. (Hint:sides=5). |
10:17 | Draw a perpendicular bisector to one of the sides of the pentagon. |
10:21 | Create a point inside the pentagon. |
10:25 | Set Trace On for the point. |
10:27 | Get reflection of the point about the perpendicular bisector. |
10:31 | Set Trace On for the image point. |
10:34 | Trace the pentagon to see if you have selected the correct line of symmetry. |
10:44 | Rotate the original pentagon counter clockwise in 135° at a point. |
10:49 | Dilate the pentagon at a point by the factor of 3. |
10:56 | The assignment should look like this. |
11:03 | Watch the video available at this URL. |
11:06 | It summarizes the Spoken Tutorial project. |
11:09 | If you do not have good bandwidth,you can download and watch it. |
11:12 | The Spoken Tutorial Project Team : Conducts workshops using the spoken tutorials. |
11:17 | Gives certificates to those who pass an online test. |
11:20 | For more details, please write to contact@spoken-tutorial.org. |
11:26 | Spoken Tutorial Project is a part of the Talk to a Teacher project. |
11:29 | It is supported by the National Mission on Education through ICT, MHRD, Government of India. |
11:35 | More information on this Mission is available at this link. |
11:39 | This is Neeta Sawant from SNDT University Mumbai, signing off.
Thanks for joining. |
Contributors and Content Editors
Madhurig, Minal, Mousumi, PoojaMoolya, Pratik kamble, Sandhya.np14