Find out what the interior angles in the shape should add up to. For example in a square the angles add up to
360 degrees. You should then divide 360 by how many angles there are, this equals 90 degrees.
How to work out how many angles there are in a shape?
An easy way to work out how many angles there are inside a shape is to work out how many
triangles can fit into the shape and then times that number by 180.