# WHY must a square add up to 360° (in pictures)

Because there are now 2 triangles in the square, each equaling 180^@, it must add up to 2times180°=360°

The square can be made from 2 triangles.

Example 1

If you push over only one side of the square, the square's interior angles still add up to 360°.

90°+90°+110°+70°=360°

Again, we know this because this new shape is still made up of two triangles.

And 2 triangles are 2times180=360°