To find the missing angles in an equilateral triangle, divide the sum of interior angles in a triangle by 3 In an isosceles triangle, two of the sides are equal.

In order to work out the size of missing interior angles in polygons, it is important to know what the interior angles add up to: The interior angles of a triangle sum to 180°. The interior ...

The class Geometry: Triangles discusses triangles and the specific mathematical operations unique to them. While the triangle is a very basic shape, it can be found as a part of more complex shapes.