# Area of a Circle

## Area of a Circle

The measurement of the surface enclosed by a circle.

### Formulas

A = $$πr^{2}$$ or A = $$π\frac{d^{2}}{4}$$

### Example

Consider a circle with a radius of 10 cm.

$$A = πr^{2} = π × 10^{2} = 100π$$.

$$A ≈ 314.16$$