GeoGebra-5.04/C3/Create-action-object-Tools/English-timed

Time	Narration
00:01	Welcome to the Spoken Tutorial on Create Action Object Tools in GeoGebra.
00:07	In this tutorial we will learn about free and dependent Objects.
00:14	We will also learn to, Create a check-box Create an insert button Insert an input box
00:23	To record this tutorial, I am using; Ubuntu Linux OS version 16.04 GeoGebra version 5.0438.0-d
00:36	To follow this tutorial, learner should be familiar with GeoGebra interface. For the prerequisite GeoGebra tutorials, please visit this site.
00:47	In this tutorial we will use tangents to a circle tool created in the previous tutorial.
00:54	To practise this tutorial you need to download the zip file given in the Code files link.
01:00	Extract the downloaded zip file.Locate tangents-circle.ggt file in the extracted folder.
01:10	I have already downloaded and extracted the file to my Desktop.
01:15	I will right-click on it and Open With GeoGebra.
01:20	Click on Tangents to a circle tool and click two points in the Graphics view.
01:28	Tangents to a circle are drawn in the Graphics view.
01:32	Now I will explain about Free and Dependent Objects.
01:37	Let us complete the figure.
01:40	Click on the Intersect tool. Mark points of intersection of the tangents to the circle.
01:49	Using the Segment tool we will join A C, A D and A B.
02:00	In the Algebra view, note that segment AC is equal to segment AD. They are radii of the circle c.
02:09	Now let's measure the angles at the point of contact of the tangents to the circle.
02:15	Click on the Angle tool and click on the points B, C, A. and then click on the points A, D, B.
02:32	Observe that the angles alpha and beta are 90 degrees.
02:37	This is because at the point of contact, tangent to a circle is perpendicular to the radius.
02:44	In the Algebra view, click on the arrow triangle named as Toggle Style Bar.
02:50	Auxillary Objects, Sort Objects by drop-down and fx drop-down appear.
02:58	Click on Sort Objects by drop-down.Sort by menu opens.
03:05	This menu has, Dependency, Object Type, Layer and Construction Order check-boxes.
03:15	By default, Object Type check-box is selected.
03:19	In other operating systems a different check-box may be selected.
03:24	Let us select Dependency check-box.
03:28	Note that only points A and B are under Free Objects. All other objects are under Dependent Objects.
03:38	You can select other check-boxes and see how the objects are sorted.
03:45	Now we will learn how to create a check-box.
03:49	Click on the Check Box tool and click in the Graphics view.
03:56	Check Box to Show/hide Objects dialog box opens.
04:00	In the Caption text box, I will type Angles.
04:04	From the Select objects drop-down, let us select Angle alpha and Angle beta.
04:12	Then click on Apply button in the box.
04:16	Angles check-box appears in the Graphics view.
04:20	Let us click on Move tool to avoid clicking of other objects in the Graphics view.
04:27	Angles check-box is shown as a Boolean Value a in the views.
04:33	Using this check-box, we can show or hide the angles alpha and beta.
04:39	In the Algebra view, Boolean Value is true when the angles are shown.
04:44	Boolean Value becomes false when they are hidden.
04:49	Now we will insert an input box.
04:51	Click on the Input Box tool and click in the Graphics view.
04:59	Input Box appears in the Graphics view.
05:02	In the box, type the Caption as Circle.
05:06	In the Linked Object drop-down, select circle c. And click on OK button in the box.
05:14	Circle input box, along with its coordinates, appears in the Graphics view.
05:20	Click on Move tool to select it.
05:23	In the input box, type B in place of A and press Enter.
05:29	The tangents, angles and all related objects disappear.
05:34	Position of the circle has also changed
05:38	This happens because all the objects are dependent on point A.
05:44	As an assignment, In the circle input box change (A,B) to (B,A) and (A,A) and see what happens. Explain your observation.
05:57	Click on Undo button to undo the changes
06:01	Now, we will learn how to create a button.
06:04	Click on the Button tool and click in the Graphics view.
06:10	The Button dialog box opens.
06:13	Type Caption as Value.
06:16	In GeoGebra Script box type the following script.
06:20	Now I will explain the script.
06:23	This line will change the position of the coordinates of A to A-1 This means that the x coordinate of A becomes x-1 and y coordinate of A becomes y-l.
06:37	Similarly this line will change the poistion of the coordinates of B to B+2.
06:43	This line will set the colour of segment j to blue.
06:47	This line will set the colour of segment h to green.
06:51	This line will set the colour of segment i to red.
06:55	Click on the OK button at the bottom.
06:58	Value button appears in the Graphics view.
07:02	Select the Move tool and Click on value button.
07:08	Observe the changes in the Graphics view.
07:11	Observe that the coordinates of point A and point B have changed.
07:16	The colours of the segments have changed accordingly.
07:20	Click on Zoom Out tool and click in the Graphics veiw to zoom out.
07:26	I will click the Value button again. Observe the changes in the coordinates of points A and B.
07:35	As an assignment, Create a new button. Write a GeoGebra script to change the colour and position of the points A and B.
07:46	Now we will combine action tools and see what happens.
07:51	I have opened a new GeoGebra window.
07:55	Click on the Slider tool and click in the Graphics view.
08:01	The Slider dialog box opens.
08:04	By default, Number radio button is selected with Name as a. We will leave it as it is.
08:13	We will set the Min value to 1, Max to 10 and Increment to 1.
08:21	Click on OK button at the bottom. A number slider a appears in the Graphics view.
08:28	Now click on Regular Polygon tool and click two points in the Graphics view.
08:36	Regular Polygon text box opens. In the Vertices text box, type a and click OK in the box.
08:46	Notice in the Algebra view, under Polygon we have poly1 undefined.
08:52	As a we drag the slider, notice that polygons with different sides appear.
09:05	Now we will insert an input box.
09:08	Click on Input Box tool and click in the Graphics view.
09:15	Input dailog box opens.
09:18	Type the Caption as Number of sides in the box.
09:22	Select a=1 in the Linked Object drop-down. Click on OK button in the text box.
09:30	Number of sides input box appears in the Graphics view.
09:35	In the Algebra view, uncheck the number slider a=1 to hide the slider.
09:41	In the Number of sides input box, type 4 and press Enter. You will see a square.
09:50	Likewise, you can type any number between 3 to 10 and see the respective polygon.
09:57	As an assignment, Create a check box to show and hide the slider and the input box.
10:04	Let us summarise. In this tutorial we have learnt about free and dependent objects.
10:12	We have also learnt to, Create a check-box Create an insert button Insert an input box
10:22	The video at the following link summarizes the Spoken Tutorial project. Please download and watch it.
10:30	The Spoken Tutorial Project team conducts workshops and gives certificates. For more details, please write to us.
10:38	Please post your timed queries in this forum.
10:42	Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India. More information on this mission is available at this link.
10:54	This is Madhuri Ganapathi from, IIT Bombay signing off. Thank you for watching.

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