Question

Diameter = 10.5in.we are learning something about area of circle.

Answer 1

Use the formula for the area of a circle:

`A=\pi\cdot r^2`

First, we need to find the radius r. Since the radius is half the diameter, then:

`\begin{gathered} r=\frac{10.5\text{ in}}{2} \\ \therefore r=5.25in \end{gathered}`

Substitute the value for r in the formula for the area of the circle:

`\begin{gathered} A=\pi\cdot(5.25in)^2 \\ \approx86.6in^2 \end{gathered}`

Therefore, the area of a circle of diameter 10.5 in is approximately 86.6 squared inches.