Question

find the area.
a = ? ft²
a = πr²
use π = 3.14

Explanation:

Step1: Find the radius

The diameter \(d = 14\) ft. The radius \(r=\frac{d}{2}\), so \(r=\frac{14}{2}=7\) ft.

Step2: Calculate the area

Use the formula \(A = \pi r^{2}\). Substitute \(r = 7\) and \(\pi=3.14\). Then \(A=3.14\times7^{2}\). First, \(7^{2}=49\). Then \(A = 3.14\times49\). \(3.14\times49=(3 + 0.14)\times49=3\times49+0.14\times49=147+6.86 = 153.86\).

Answer:

\(153.86\)