Base angles of an isosceles triangle are equal.

Geogebra Activity related with base angles of an isosceles triangle.

Instructions: Toolbar Image Polygon Tool Toolbar Image slider tool. Toolbar Image angle tool Toolbar Image text tool Toolbar Image line segment with given length.Toolbar Image Move tool. 1. Move the slider tool to make the sides dynamic. 2. Find the equal sides and base of the isosceles triangle. 3. Move the point A and observe the angles . Observe that the base angles Toolbar Image are equal or not. 4. Move the point B and observe the angles . Observe that the base angles Toolbar Image are equal or not. 5. Draw the conclusion. Note : Construction protocol in pdf format is also included in this applet. 

polygon tool.
By Mahanth Chaudhary Mathematics Teacher and Trainer

Protocol for base angles of an isosceles triangle