Inscribed Quadrilaterals
Common Core: G.C.3

Inscribed Quadrilaterals

Author: Graham Pardun
This lesson will demonstrate how if a quadrilateral is inscribed in a circle, then the opposite angles are supplementary.
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A Quadrilateral Inscribed Within a Circle Has Some Special Properties

...and one of those properties is that the opposite angles of the quadrilateral are supplementary! Here's how to use that fact to your advantage!