Angle Relationships in Cyclic Quadrilaterals

This lesson explores angle relationships in cyclic quadrilaterals using the central angle theorem. It begins with an introduction to cyclic quadrilaterals, which have all vertices on a circle. The central angle theorem is explained, stating that an inscribed angle is half the central angle. The lesson then proves that opposite angles in a cyclic quadrilateral sum to 180 degrees using theorems about circles. The proof is verified with different angles, confirming that the sum of all angles in a quadrilateral is 360 degrees. The lesson concludes by emphasizing that the theorem applies only to cyclic quadrilaterals.

What is the significance of the measure of arcs in relation to the angles in a cyclic quadrilateral?

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Why is the theorem about opposite angles not true for all quadrilaterals?

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