Question

What is the approximate area of a circle with a diameter of 15 in?

Answer 1

The area of a circle is calculated as ,

$a=\pi r^2$

Here, r is the radius, which is same as that of hlf the diameter.

So,

$r=\frac{d}{2}=\frac{15}{2}=7.5\text{ in}$

Therefore the area is,

$\begin{gathered} a=\pi\times7.5^2 \\ \text{ =3.14}\times56.25 \\ \text{ =}176.652in^2 \end{gathered}$