To calculate the area of a rectangle, multiply two sides that are perpendicular to each other.

To calculate the area of a right triangle, multiply two perpendicular sides and divide by two. If the triangular pieces aren't right triangles, cut the triangle into two right triangles and add the sq footage together.

To calculate the area of a right triangle, multiply two perpendicular sides and divide by two. If the triangular pieces aren't right triangles, cut the triangle into two right triangles and add the sq footage together.