More interesting math facts here !

Area of Circle

$$ \pi \cdot r^2 $$

### Power Of the Point

Circumference of Circle

$$ 2\pi \cdot r \\ \pi \cdot diameter $$

### Theorems, Formula Circles Quiz

To solve this probelm, you must remember how to find the meaure of the interior angles of a regular polygon. In the case of a pentagon, the interior angles have a measure of (5-2) •180/5 = 108 °. Therefore, each inscribed angle creates an arc of 216°

Use the inscribed angle formula and the formula for the angle of a tangent and a secant to arrive at the angles

- mBDE = 72 °
- mBFC = 72 °
- mAGD = ½(144 −72) = 36 °