# Inscribed Quadrilaterals

- Author:
- Katie Drach

- Topic:
- Quadrilaterals

## Inscribed Quadrilaterals

and are ** opposite angles** of quadrilateral BDCG. Notice that these two angles are supplementary. Move vertices B, D, C, and G to see that this relationship is always true of opposite angles.
Using what you know about inscribed angles and circles, why do you think that opposite angles of a quadrilateral must always be supplementary?