TRIANGLE & 180 degrees

All people know that the sum angle in triangle is 180 degrees, unfortunately most of them didn’t know how to find it. In this post, I will share how to find the sum angle in triangle.

Consider the picture below !

Step one : Fold the triangle become the picture below !

Step two : Give bullets like the picture below !

From the picture, we can conclude that

So that the sum of angle in triangle equal to 180 degrees.