Problem 71. Cyclic Quadrilateral, Angles. Level: High School, SAT Prep, College

In a cyclic quadrilateral ABCD prove that each exterior angle is equal to the opposite interior angle. Post a comment or solution.
 

More Geometry Problems:

Proposed Problem 72: Intersecting Circles. Cyclic quadrilateral, Chords, Parallel.

Proposed Problem 70: Squares inscribed in a triangle, Similarity.

Proposed Problem 69: Square inscribed in a triangle, Similarity.

Proposed Problem 68: Triangle, Incircle, Inradius, Tangent, Similarity.