Diagram used to prove the theorem: "The sum of the face angles of any convex polyhedral angle is less…

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…

Illustration of a circle with two intersecting chords within the circumference. The angle formed is…