9.3+Inscribed+Angles+and+Arcs


 * Inscribed Angle Theorem:** The measure of an angle inscribed in a circle is equal to 1/2 the measure of the intercepted arc.


 * Right Angle Corollary:** If an inscribed angle intercepts a semicircle, then the angle is a right angle.


 * Arc-Intercept Corollary:** If two inscribed angles intercept the same arc, then they have the same measure.