# How do you find the area of a circle with the diameter of 10?

$a r e a = \pi {r}^{2}$ where r is the radius or
$a r e a = \pi {\left(\frac{D}{2}\right)}^{2}$ where D is the diameter
Most people us 3.1416 as a value for $\pi$
Not as close as this is $\frac{22}{7}$