The area of a circle is calculated as ,
[tex]a=\pi r^2[/tex]
Here, r is the radius, which is same as that of hlf the diameter.
So,
[tex]r=\frac{d}{2}=\frac{15}{2}=7.5\text{ in}[/tex]
Therefore the area is,
[tex]\begin{gathered} a=\pi\times7.5^2 \\ \text{ =3.14}\times56.25 \\ \text{ =}176.652in^2 \end{gathered}[/tex]
