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