Question

find the area of this circle.
use 3.14 for π.
5 cm
area of a circle
a = πr²
a = ? cm²
round your answer to the nearest tenth.

Explanation:

Step1: Substitute the radius into the formula

The formula for the area of a circle is \(A = \pi r^{2}\). Given \(r = 5\) cm and \(\pi=3.14\), we substitute \(r\) into the formula: \(A=3.14\times5^{2}\).

Step2: Calculate \(5^{2}\)

\(5^{2}=5\times5 = 25\). So the formula becomes \(A = 3.14\times25\).

Step3: Perform the multiplication

\(3.14\times25=(3 + 0.14)\times25=3\times25+0.14\times25=75 + 3.5=78.5\).

Answer:

\(78.5\)