What Is Angle Chasing?

Angle chasing is a popular method of solving problems in geometry that employs various properties of, and identities that include angles.

Angles are basic elements in many geometric situations; there are inscribed, secant, complementary, vertical, supplementary angles.

Equal angles emerge as

  • inscribed into the same circle and subtended by the same or equal arcs,

  • two halves of an angle divided by the angle bisector,

  • corresponding angles in equal or similar triangles or other shapes,

  • corresponding or alternate angles in parallel lines.

It's worth remembering that

Here is an incomplete list of problems at this site where angle chasing plays a major role in the solution:

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