Question

the radius of a circle is 9cm. find the area of the circle. (use 3.14 as the approximation of π)

Explanation:

Step1: Recall the formula for the area of a circle

The formula for the area of a circle is \(A = \pi r^{2}\), where \(r\) is the radius of the circle.

Step2: Substitute the given values into the formula

Given \(r = 9\) cm and \(\pi\approx3.14\), we substitute these values into the formula: \(A=3.14\times9^{2}\).
First, calculate \(9^{2}=81\). Then, \(A = 3.14\times81\).

Step3: Perform the multiplication

\(3.14\times81=(3 + 0.14)\times81=3\times81+0.14\times81=243+11.34 = 254.34\)

Answer:

\(254.34\) \(cm^{2}\)