Category: GeoGebra Tutorials

No	Tool	Instructions
1		Open the Tutorial 2 file. Use the View menu to hide the Algebra view.
2		To measure angle BAC, select the Angle tool, and click points B, A, C in that order. Notice that an angle symbol appears on angle A. Use the same tool to measure the remaining interior angles. For the mean time, ignore the reflex angles.
3		Click the angles and change their colors on the Styling Bar located at the upper-left of the Graphics view. Apply similar colors to congruent angles.
4		To disallow reflex angles, right click on angle A* (right click the sector), and select Object Properties from the pop-up menu.
5		In the Object Properties window, click the Basic tab, and uncheck the Allow Reflex Angle check box, and click the Close button. Repeat the process to disallow reflex angles on other interior angles.

< Previous Tutorial ** Next Tutorial >

No	Tool	Instructions
1		Construct segment AB.
2		Select the Compass tool, click on the segment and then click on A. This will form a circle with center A and passing through B.
3		Construct point C on the circle.
4		Construct segment BC. Move point C, what do you observe?
5		Right click on the circle and then click Show Object from the pop-up menu to hide it.
6		To construct a line parallel to AB passing through C, select the Parallel line tool, click on segment AB, and then click on point C. Now, use the same tool to construct a line parallel to AC and passing through B.
7		Now, intersect the two lines to form the fourth vertex of the rhombus. Hide the two lines and construct segments BD and CD.
8		Hide the two lines by right clicking them and clicking Show Object, and then construct segments BD and CD.

< Previous Tutorial ** Next Tutorial >

No	Tool	Instruction
1		Select the New Point tool and click three different locations on the Graphics view.
2		To construct side AB, select the Segment between Two Points tool click point A, and then click point B. Use the same tool to construct segments AC and BC .
3		Select the Move tool and drag the points. What do you observe?
4		To construct the midpoint of AB, select the Midpoint or Center tool, click point A, and then click point B. Now, get the midpoints of AC and BC. After this step, your drawing should look like the following figure.
5		To construct the medians, use the Segment between Two Points tool to construct segments AF, BE, and CD, the medians of the triangle.
6		To intersect the medians, select the Midpoint or Center tool, and then click any of the two medians.

Explore More!

• Move points A, B, and C. What do you observe about the medians?
• What conjecture can you make about the medians of a triangle?
• Move the points and the segments on the figure. Which objects can/can’t be moved? Why?

Next Tutorial >

More tools in each category can be displayed by clicking the triangle at the bottom-right of each tool. Once the list of tools is displayed, the user can select a tool by clicking on it. The icon of the selected tool will then be displayed on the toolbar.

 

The selected tool is highlighted by the blue border as shown in both figures. To deselect a tool, you can click on the Move tool or press the Esc key on your keyboard.

Parts of GeoGebra

• Menu bar – used for managing files, modifying preferences, and customizing settings.
• Toolbar – used for constructing and modifying mathematical objects.
• Graphics view – used for displaying geometric representations of mathematical objects
• Algebra view – used for displaying algebraic representations of mathematical objects.
• Input bar – used for inputting equations and performing mathematical computations

• GeoGebra Step-by-Step Tutorials. More than 50 step-by-step tutorials.
• GeoGebra Wiki on Pbworks.com.
• GeoGebra Wiki on Wikispaces.com
• Math 247 on Pbworks.com
• GeoGebra Help. Contains tutorials such as GeoGebra QuickStart
•  GeoGebra Help Documents and GeoGebra Book all of which in Portable Document (PDF) format.
•  A GeoGebra Tutorial step-by-step tutorials by Marc Renault
• GeoGebra Workbooks. Excellent workbooks by the Regional Center of Excellence in Mathematics Teaching and Learning, University of Limerick.
• YouTube GeoGebra Channel