Stage 18 · Circles

18.3 The Inscribed Angle Theorem — Seeing the World from On the Circle

Introduce the inscribed angle, with its vertex on the circle, and establish its half relationship with the central angle plus a run of corollaries — this is the heart of the stage.

5 knowledge points

Knowledge point pages

18.3.1 What an Inscribed Angle Is 18.3.2 The Inscribed Angle Theorem: Half the Central Angle 18.3.3 Inscribed Angles on the Same Arc Are All Equal 18.3.4 The Angle Facing a Diameter Is a Right Angle 18.3.5 Opposite Angles of a Cyclic Quadrilateral Add to a Straight Angle

eastmath.com · 18.3 The Inscribed Angle Theorem — Seeing the World from On the Circle