# Exploring Isosceles Triangles (Version A)

- Author:
- Tim Brzezinski

- Topic:
- Geometry, Isosceles Triangles, Triangles

## In the GeoGebra Geometry app window below:

1) Use the CIRCLE WITH CENTER THROUGH POINT tool to construct a circle with center

*A*that passes through*B*. 2) Select the POINT ON OBJECT 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 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 tool.
5) Use the ANGLE tool to find and display the measures of all 3 angles of this triangle.

## 6)

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