Question

find the area. 20 ft a = ? ft² a = πr²

Explanation:

Step1: Find the radius

The diameter \(d = 20\) ft. The radius \(r=\frac{d}{2}\), so \(r=\frac{20}{2}=10\) ft.

Step2: Calculate the area

Use the formula \(A=\pi r^{2}\). Substitute \(r = 10\) and \(\pi=3.14\). Then \(A=3.14\times10^{2}\).
First, calculate \(10^{2}=100\).
Then \(A = 3.14\times100=314\) \(ft^{2}\).

Answer:

\(314\)