Base angles of an isosceles triangle are equal.

Instructions: Polygon Tool slider tool. angle tool text tool line segment with given length. 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 are equal or not. 4. Move the point B and observe the angles . Observe that the base angles are equal or not. 5. Draw the conclusion. Note : Construction protocol in pdf format is also included in this applet.