Question

find the area.
10 in
a = ? in²
a = πr²
use π = 3.14

Explanation:

Step1: Find the radius

The diameter \(d = 10\) in. The radius \(r=\frac{d}{2}\), so \(r = \frac{10}{2}=5\) in.

Step2: Calculate the area

Use the formula \(A=\pi r^{2}\). Substitute \(r = 5\) and \(\pi=3.14\) into the formula.
\(A=3.14\times5^{2}\)
First, calculate \(5^{2}=25\). Then \(A = 3.14\times25\)
\(A=78.5\)

Answer:

\(78.5\)