Title of the tutorial: Introduction-to-Geogebra
Author: Bindu Thirumalai
Key words: Algebra view, Input bar, Axis, grid, Pencil tools, Segment between two points tool, Distance tool, free objects, dependent objects, Graphics view, video tutorial.
|Show slide number 1|| Hello Everybody
Welcome to the tutorial Introduction to Geogebra.
In this tutorial I will introduce you to the basics of getting started with Geogebra.
| Switch to slide number 2
(What is Geogebra?)
| What is Geogebra ? It is a free mathematics software and is available at www.geogebra.org 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 and deal with variables, vectors etc..
| Switch to slide number 3
| To get started with Geogebra, I am using the Linux operating system Ubuntu Version 10.04 LTS and Geogebra Version 184.108.40.206
|Switch to Desktop to Open Geogebra|| 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.
| Switch back to Slide 3
|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.|
| Switch to Geogebra Application
to explain the window
| A typical Geogebra window looks like this.
It has a standard menu bar like any window based application.
The tool bar is like the compass box of Geogebra.
The tool view tells you which tool is selected and ready for use.
The graphic view is the drawing pad of Geogebra. You can construct geometric figures on this pad.
This is the algebra view. In this window you can see the algebraic expressions of all the geometric figures constructed on the drawing pad.
The Input Bar allows you to input algebra equations which will be made visible on the drawing pad as well as the algebra view.
The commands supported by Geogebra in the input bar are in this drop down menu.
|On Geogebra Window View menu Item|| The drawing pad is always visible in Geogebra and cannot be closed.
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.
| The Tool Bar in Geogebra
Move Drawing Pad
| Now the tool bar or the compass box in more detail.
To use a tool click on an item.
If you click on the small red triangle in the corner of the tool you will see all the pencil or the point tools.
| Switch to Slide 3
|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.|
| Geogebra Window
Using the Tool
| Now let us draw points. Select the new point option, click anywhere on the drawing pad. You get new points.
All tool items drawn on the drawing pad are called objects in Geogebra.
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
Notice that there are no unit on the grid. We will explore unit names in more advanced topics.
If you don't want to draw any object, please use the arrow tool here. So when you use that it will not draw any object on the drawing pad.
|Geogebra Window - Object Properties|| Now to change the object properties move your mouse over the object, when it get highlighted right click and click on object properties.
|Geogebra Window - Move Tool Item|| 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.
For example if we move points A or B , you will notice that the parallel line also moves along maintaining its parallel property.
|Geogebra Window -Saving and Opening a File|| 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.
| Switch to Slide 4
| Finally to ASSIGNMENT.
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 tool.
Finally test the rectangle you have constructed using the move tool and moving the free objects.
|Switch to Geogebra File rectangle.ggb|| I have already constructed this assignment here. I have started with Line segment AB and I have constructed the rectangle ABED.
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.
| Switch to Slide 5
| I would like to acknowledge the spoken tutorial project which is part of the talk to a teacher project.
It is supported by the National Mission on Education through ICT, MHRD government of India.
And you can see more information about this at this website.
|Switch to Slide 6||Thank you this is Bindu signing off. Enjoy exploring Geogebra.|