Difference between revisions of "Geogebra/C2/Introduction-to-Geogebra/English-timed"

|Hello Everybody. Welcome to the tutorial Introduction to Geogebra. In this tutorial I will introduce you to the basics of getting started with Geogebra.

|What is Geogebra ? It is a free mathematics software and is available at www.geogebra.org to download.  

|It is useful for computer aided learning as it is interactive, and you can see the algebraic expressions of geometric figures and vice versa.

|It combines Geometry , Algebra and Calculus. So you can construct geometric figures, enter equations, deal with variables, vectors etc..

|To get started with Geogebra, I am using the Linux operating system Ubuntu Version 10.04 LTS and Geogebra Version 3.2.40.0

| If you have already installed Geogebra, go to the Ubuntu Menu Item '''Applications''','''education''' or '''science''' and click on the '''Geogebra Application'''.

|If you have not installed Geogebra, please go to '''system , administration, synaptic package Manager''' to install Geogebra.  

| Now let us explore the Geogebra window . In this tutorial I will briefly explain the menu bar, the tool bar and tool view, the graphics view and algebra view. The input bar and commands.

|A typical Geogebra window looks like this.It has a standard menu bar like any window based application.

|The graphic view is the drawing pad of Geogebra. You can construct geometric figures on this pad.  

|On the '''drawing pad''' you can use the grid by going to '''view''' and checking on the '''grid''' option.  

|Similarly you can un-check the '''axes''' if you don't want to see it. We will keep the '''axes''' and '''grid''' visible for this tutorial.  

|If you choose to close the algebra view or Input Bar you may do so by going to '''view''' and un checking the option. Let us remove the '''input bar''' from this tutorial.  

|Now the tool bar a '''compass box''' in more detail. To use a tool click on an item.  

|The '''move drawing pad''' is the right most '''tool''' item. Click on it and then click on the drawing pad. Keep the left click depressed and move the drawing pad to the desired position.

|Similarly the next set of tool items are for lines. Then these '''perpendicular lines''' and '''bisectors, polygons, '''circles''' etc.

|In this tutorial I am going to take you through drawing points, line segments, parallel and perpendicular lines measuring objects , changing object properties and saving a file.

|Now let us draw points. Select the new point option, click on anywhere on the drawing pad. You get new points.  

|Points '''A''' and '''B''' are free objects, that is they are not dependent on any other object on the drawing pad.

|You can draw a line segment by going to '''segment between two points''' using two existing points like '''A''' and '''B''' or click anywhere else on the drawing pad and you will get two new points and the segment between these two points.

|Similarly you can draw a perpendicular line by checking a point and then the line you will get a perpendicular line through point '''D''' Perpendicular to segment '''CD'''.

| Now you can find the point of intersection of two objects if you go to this tool here and click on intersect two objects.  

| When you move your mouse over the intersection both the objects get highlighted at that time click you will get the intersection of the two objects  

|You may measure the distance between points by selecting the two points clicking '''DF''' here or you may select an entire line segment.  

|You can change the properties such as the label and colour of each of the items Before that  

|If you don't want to draw any object, please use the arrow key here. So if when you use that it will not draw any object on the drawing pad.  

| Now to change the object properties move your mouse over the object, when it get highlighted right click and click on '''object properties'''.

|To change the name, type a new name. You can also type a caption. You can choose to show the object or not show it.  

|You can choose to not show the label or you can show one of these options. Lets keep the caption on  

|The left most tool item the move tool item is a very useful tool for teaching as it makes the lesson dynamic and interactive.  

|All free objects may be moved.  

|All the dependent objects of the free objects will move preserving their property, when the free object is moved.

|To save a file, select the item '''file''' select '''Save As '''select the folder I will go to Documents Geogebra. Enter the file name and click save.  

|Notice that the name appears in the top panel and it is saved as a '''.ggb file''' like all geogebra files.

|Now to open a file you have to click on file, open and select any file to open.  

|In the assignment I would like you to draw a rectangle by using the segment between two points tool, start with that.  

|Then use the parallel line and perpendicular line. The Intersect two objects and the distance or length tools.  

|Finally test the rectangle you have constructed by using the move tool and move the free objects.  

|Now if I click on the move tool item and move the free objects notice that any position my rectangle '''ABED''' remains a rectangle if constructed properly.

|Thank you this is Bindu signing off. Enjoy exploring Geogebra.