GeoGebra-5.04/C2/Introduction-to-GeoGebra/English-timed

Time	Narration
00:01	Welcome to this tutorial on Introduction to GeoGebra.
00:05	In this tutorial, we will learn, About GeoGebra interface and geometric tools
00:12	To draw parallel and perpendicular lines
00:16	To change object properties of a line About properties of Graphics view.
00:22	Here I am using, Ubuntu Linux OS, version 14.04
00:28	GeoGebra version 5.0.438.0-d
00:33	To follow this tutorial, learner should be familiar with basic Mathematics.
00:40	To open GeoGebra applicaton in Ubuntu Linux OS, click on Dash Home.
00:46	In the search bar type geogebra. GeoGebra icon appears.
00:52	Double-click on the icon to open the GeoGebra application.
00:57	Let us open GeoGebra application in Windows 10 OS.
01:04	In Search the web and Windows box, type geogebra.
01:09	GeoGebra appears in the list.
01:12	Click on it to open the GeoGebra application.
01:17	This is the GeoGebra interface.
01:20	It has a standard menu bar with menu items, File, Edit, View, Options, Tools, Window and Help.
01:37	Below the menu bar, is a tool bar with various geometric tools.
01:43	On the right side of the tool bar, we have Undo, Redo, Help and Preferences options.
01:53	Below tool bar we have Algebra view and Graphics view.
01:58	In GeoGebra, geometry and algebra work side by side.
02:03	Graphics view is used to create geometric figures using tools on the toolbar.
02:09	Algebra view displays the corresponding algebraic expressions of the drawn figures.
02:15	Using View menu, we can open or close any view based on our requirement.
02:25	At the bottom of the window, we have an input bar.
02:29	We can directly enter algebraic commands and functions using the input bar.
02:36	By default grid and axes options are enabled on the Graphics view.
02:42	You can disable the axes or grid using the context menu.
02:47	Right click on Graphics view. The Graphics menu opens.
02:53	In this menu, we have options to check and uncheck Axes and Grid.
03:00	Let me show you another method to enable or disable the axes and grid.
03:05	Notice a small arrow triangle next to Graphics, named as Toggle Style Bar.
03:12	Click on the arrow triangle to open the drop-down menu.
03:16	Here you will see options to check and uncheck axes and grid.
03:22	Next we will learn about the tool bar in detail.
03:26	Let us click on Move Graphics View tool at the right end of the toolbar.
03:31	Notice that, a dark blue border appears around the tool. This indicates that the tool is selected.
03:38	Hover the cursor on the tool. Its name and function appears in the tool tip box.
03:45	Using this selected tool, we can move the Graphics view. Click and drag the Graphics view as required.
03:53	Each tool has a small black triangle at its corner.
03:58	When the cursor is placed on the triangle, it turns red.
04:03	Let us click on Move tool on the tool bar. A drop-down list of related tools appear.
04:10	Let us draw points in the Graphics view.
04:13	Click on Point tool and then click on the Graphics view Point A is drawn.
04:20	Again click to draw another point B.
04:24	Note that the corresponding coordinates of the points appear in the Algebra view.
04:29	Let us learn to draw a line. Click on the triangle at the corner of Line tool.
04:36	Here you can see a list of Line tools to draw various types of lines.
04:42	Using Line tool, we will draw a line through points A and B.
04:47	Click on Line tool and click on points A and B.
04:53	Line f passes through A and B.
04:57	Let us delete all the objects on the Graphics view.
05:01	Press Ctrl+A to select all the objects. Press Delete key on the keyboard.
05:08	Let us redraw the line AB. Click on Line tool and click on the Graphics view.
05:17	Click again at a different place to draw the line AB.
05:22	Next I will draw a line perpendicular to line AB.
05:27	To do that, click on the Perpendicular Line tool.
05:31	Click above line AB to draw point C, then click on line AB.
05:38	Line g passing through C is perpendicular to line AB .
05:43	Let us draw a line parallel to line AB.
05:47	Click on Parallel Line tool.
05:50	Click below AB to draw point D, then click on line AB.
05:57	A line h, parallel to AB and passing through point D, is drawn.
06:02	Now we will mark intersection points for the two lines.
06:06	In the Point tool drop-down, select Intersect tool.
06:10	Click on the intersection point of the lines f and g.
06:15	Then click on the intersection point of the lines g and h.
06:20	Now we will make our drawing a bit interactive.
06:24	Click on Move tool.
06:27	Click on point A and drag.
06:30	Notice that points E and F and all lines move along with point A.
06:36	Similarly we will move points B and D.
06:40	Points E , F and the lines move along with point B.
06:45	Only point F and line h move along with point D.
06:50	Points A, B and D are independent objects.
06:56	Now I will try to move points E or F. We do not see any movement.
07:03	This indicates that, points E or F are dependent objects.
07:09	Now let us change the properties of the lines.
07:13	Right click on line AB. A context menu opens, with all the properties of the line.
07:21	Select Object Properties. Preferences window opens.
07:27	Resize the Preferences window to see the changes on the Graphics view.
07:33	I will explain some basic properties in the Preferences window.
07:38	In the Name box, you can change the name to Line AB.
07:43	And the Caption as Original Line.
07:46	Click the Show Object check box, to show or unshow the line.
07:51	The Show Label check box has a drop down to choose.
07:55	I will choose Name & Value. Notice that name and value appears below the line.
08:03	Next click on the Color tab. Here we have a color box to colour the line.
08:10	Below the colour box there is Preview box to view the changed colour.
08:15	I will click on the green box. The colour of Line AB has changed to green.
08:22	Next click on Style tab.
08:25	Here you can change, Line Thickness Line Opacity and Line Style.
08:33	Close the Preferences window.
08:36	Observe the Line AB with changed object properties.
08:41	I will change the object properties of line h.
08:45	Right-click on line h, to select Object Properties. Preferences window opens.
08:53	Here I will change the colour to pink and style to dashed line.
09:00	Close the Preferences window.
09:03	Now let us save the file. Click on File menu and select Save.
09:10	Save dialog box opens.
09:13	I will select Documents folder on my machine.
09:17	You can select any folder of your choice on your machine.
09:22	Type the File name as Lines. Then click on Save button at the bottom.
09:29	Our file is saved with .ggb extension.
09:34	Pause the tutorial and do this assignment. Open a new GeoGebra window.
09:40	Draw a line segment AB using Segment tool
09:44	Draw a perpendicular bisector to segment AB.
09:48	Rename the lines and change the object properties.
09:52	Your completed assignment should look like this.
09:57	Let's now open a new window.
10:00	Click on File menu and select New Window.
10:05	Now, I will explain about Graphics window properties. Here I will close the Algebra view.
10:13	Right click on the Graphics window.
10:16	The context menu opens with various options.
10:20	Choose Graphics option.
10:23	Preferences window opens.
10:26	In the Preferences window, we will see Basic, xAxis, yAxis and Grid tabs.
10:36	Resize the Preferences window and Graphics view and place them side by side.
10:43	We will change the basic properties of the Axes in the Basic tab.
10:48	Click on Bold check-box. This makes the Axes bold.
10:54	Click on Color button. Choose a color box appears.
11:00	You can choose any dark colour and click OK button.
11:05	The colour of the axes changes accordingly.
11:09	Next, select Line style drop down. I will select two-sided arrow option.
11:17	Now we will move on to Miscellaneous properties.
11:21	Let us change the background colour of the Graphics view.
11:25	Click on Background Color button. Choose a color box appears.
11:31	I will select light green and click OK button.
11:36	Observe that the background colour changes to light green.
11:40	Now click on Grid tab. By default, Show Grid check-box is checked.
11:47	Let us change the colour of the Grid. Click on Color button.
11:53	Choose a color box appears.
11:56	I will select Dark Green and click OK button.
12:02	Observe that the colour of the grid changes to dark green.
12:07	Close the Preferences window.
12:10	Observe the GeoGebra interface with changed properties.
12:15	As an assignment explore, 1. Grid Type options 2. xAxis and yAxis tabs
12:25	Let us summarise what we have learnt.
12:28	In this tutorial, we have learnt, About GeoGebra interface and geometric tools
12:35	To draw parallel and perpendicular lines To change object properties of a line
12:41	About properties of Graphics view
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