Illustration to show that the bisectors of two supplementary adjacent angles are perpendicular to each…

Illustration of angles with parallel sides. "GH is parallel to and lies in the same direction as DE,…

Illustration of supplementary angles. Two angles whose sum is a straight angle.

Illustration of supplementary angles. Two angles whose sum is a straight angle. This can be used tow…

Illustration of supplementary angles. Two angles whose sum is a straight angle. This can be used tow…