Question

calculate the area of the circle. formula: a = πr² use 3.14 for pi. a = ? cm² round to the nearest tenth.

Explanation:

Step1: Find the radius

The diameter \(d = 22\) cm. The radius \(r=\frac{d}{2}\), so \(r=\frac{22}{2}=11\) cm.

Step2: Calculate the area

Use the formula \(A=\pi r^{2}\). Substitute \(\pi = 3.14\) and \(r = 11\) into the formula.
\(A=3.14\times11^{2}=3.14\times121 = 379.94\)

Step3: Round to the nearest tenth

\(379.94\approx379.9\)

Answer:

\(379.9\)