Section 9.3 – Inscribed Angles and Arcs

Inscribed angle – an angle whose vertex lies on the circle and whose sides are chords of the circle.

B

Theorem: The measure of an inscribed angle is half the measure of its intercepted arc

Theorem: If an inscribed angle intercepts a semicircle, then the angle is a right angle

Theorem: If two inscribed angles intercept the same arc, then they have the same measure