The inscribed angle theorem states that an inscribed angle in a circle is equal to one-half the central angle. An alternative way of stating the theorem is that the central angle is twice the inscribed angle.
| Variable | Description |
|---|---|
| The inscribed angle is the angle from a point along the perimeter of the circle to the inscribed arc. | |
| The central angle is the angle measurement at the center of the circle to the inscribed arc. | |
| The inscribed arc is the distance traveled along the perimeter of the circle formed by the inscribed angle. |
- Derive double-angle formulas
- Derive half-angle formulas