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The sum of interior angles of a triangle is equal to 180 degree.

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