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 Inscribed Angle:  An angle is an inscribed angle if and only if its vertex lies on a circle and its sides contain chords of the circle. The measure of an inscribed angle is one half the measure of the arc that it creates.

Angles in a Circle: Investigate how the location of an angle's vertex affects its relationship to the measure(s) of the arc(s) it intercepts.

Half as Much May be Right: Explore triangles inscribed in semicircles.