Question

the radius of a circle is 7 cm. what is its area? (use π ≈ 3.14)

Explanation:

Step1: Write 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 \(r = 7\) cm and \(\pi\approx3.14\), we substitute these values into the formula: \(A=3.14\times7^{2}\).
First, calculate \(7^{2}=49\). Then, \(A = 3.14\times49\).

Step3: Perform the multiplication

\(3.14\times49=(3 + 0.14)\times49=3\times49+0.14\times49=147+6.86 = 153.86\) \(cm^{2}\).

Answer:

\(153.86\) \(cm^{2}\)