This small geogebra applet is related with sum of interior angles of a triangle.[br]Instructions to Use :[br]1. Move the points A and see how the angles are being changed but the sum is 180 degree.[br]2. Move the points B and see how the angles are being changed but the sum is 180 degree.[br]3. Similarly, Move the points B and see how the angles are being changed but the sum is 180 degree.[br]Note : Construction protocol is also included in pdf format as link.

By Mahanth Chaudhary[br]Mathematics Teacher and Trainer