Question

a = \pi r^{2} (area of a circle)

1. find a, when \pi = 3.14 and r = 3 ft

Explanation:

Step1: Substitute the values into the formula

Given \(A = \pi r^{2}\), \(\pi=3.14\), and \(r = 3\) ft. Substitute these values into the formula: \(A=3.14\times(3)^{2}\)

Step2: Calculate the square of \(r\)

First, calculate \((3)^{2}=3\times3 = 9\). So the formula becomes \(A=3.14\times9\)

Step3: Multiply the numbers

\(3.14\times9=(3 + 0.14)\times9=3\times9+0.14\times9=27+1.26 = 28.26\)

Answer:

\(28.26\) square feet