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Exploring Isosceles Triangles (Version A)

In the GeoGebra Geometry app window below:

1) Use the CIRCLE WITH CENTER THROUGH POINT Toolbar Image tool to construct a circle with center A that passes through B. 2) Select the POINT ON OBJECT Toolbar Image tool. With this tool selected, touch the circle in 2 different spots to plot two different points, C and D, on the circle itself. 3) Use the POLYGON Toolbar Image tool to construct the triangle ACD. How would you classify this triangle by its sides? Why is this?

Keep going: More directions appear below this applet.

4) Select the MOVE Toolbar Image tool. 5) Use the ANGLE Toolbar Image tool to find and display the measures of all 3 angles of this triangle.


What do you notice? (Be sure to select the MOVE tool again and move all 4 points around!)