For a right-angled triangle, follow these steps to calculate the length of a side, x, when another side and an angle Ɵ is given: Label the two sides that contain information in the diagram with ...

You know that the sum of the internal angles of a triangle always add up to 180°. So the combined total of 4 triangles would be: 180° + 180° + 180° + 180° = 720° ...