14.5.3 Cyclic Quadrilaterals
1. The figure below is a cyclic quadrilateral. Cyclic quadrilaterals are quadrilaterals inscribed in a circle (all 4 vertices lie on a circle).
2. Move points on the circle to change the figure.
3. Observe the angle measures for each vertex of the quadrilateral.
4. Look for angle pairs that are supplementary (add to 180 degrees).