INTRODUCTION TO GEOGEBRA
Jump right to the exercises!

GeoGebra is free, multi-platform dynamic mathematics software that joins geometry, algebra and calculus.

What does multi-platform mean?
Multi-platform means it works on both PCs and MACs.

What does dynamic mean?
Dynamic means that the user can interact with the computer.

Where does the name GeoGebra come from?
Take the first three letters of GEOmetry and put it together with the last five letters of AlGEBRA:

GEOmetry
AlGEBRA

How is it pronounced?
Dr. Fisher pronounces it like Algebra, except with a ‘Geo’ at the beginning. (Both G's are soft.)

Here are names that will be used for various GeoGebra elements in subsequent tutorials and worksheets.
(Some of these names are ever-so-slightly different than the names that GeoGebra uses.)

GEOGEBRA WINDOW: GeoGebra toolbar
TOOLBAR: GeoGebra toolbar
MOVE tool: GeoGebra MOVE tool
POINT tool: GeoGebra POINT tool
LINE tool: GeoGebra LINE tool
SEGMENT tool: GeoGebra SEGMENT tool     (in the pull-down menu beneath the LINE tool)
PERPENDICULAR LINE tool: GeoGebra PERPENDICULAR LINE tool
PARALLEL LINE tool: GeoGebra PARALLEL LINE tool     (in the pull-down menu beneath the PERPENDICULAR LINE tool)
POLYGON tool: GeoGebra POLYGON tool
CIRCLE tool: GeoGebra CIRCLE tool
ANGLE tool: GeoGebra ANGLE tool
REFLECT ABOUT LINE tool: GeoGebra REFLECT ABOUT LINE tool
SLIDER tool: GeoGebra SLIDER tool
MOVE DRAWING PAD tool: GeoGebra MOVE DRAWING PAD tool
MENU: GeoGebra menu

Notation like ‘Options-Angle unit-Radians’ is used to mean the following:
  • Click on   Options   in the MENU.
  • In the sub-menu that appears, click on   Angle unit .
  • In the sub-menu that appears, click on   Radians .
ALGEBRA WINDOW: GeoGebra algebra window
GEOMETRY WINDOW (or DRAWING PAD): GeoGebra geometry window
INPUT FIELD: GeoGebra input field
DEGREE MENU: GeoGebra degree menu

(This menu contains the degree symbol, constants, functions, and relations.
I call it the ‘degree menu’ because that symbol was originally what showed.)
GREEK LETTER MENU: GeoGebra Greek letter menu
COMMAND MENU: GeoGebra command menu
Master the ideas from this section
by practicing the exercise at the bottom of this page.

When you're done practicing, move on to:
GeoGebra Worksheet: Triangles

Or, bypass GeoGebra and move on to:
Segments, Rays, Angles


On this exercise, you will not key in your answer.
However, you can check to see if your answer is correct.
(MAX is 26; there are 26 different problem types.)