Sum of interior angles in a triangle
- Author:
- PGelisa2
- Topic:
- Geometry
Sum of interior angles in a triangle:
Procedure:
1) Find the midpoints of AC and BC
2) Connect the midpoints to form the midsegment
3) Form the perpendicular folding lines to base AB
4) Mirror the vertices A B and C to A' B' and C' around the folding lines by using the gliders
5) Show the angles A' B' and C'