Question

find the area of a circle with diameter 18 in. use the value 3.14 for π, and do not round your answer. be sure to include the correct unit in your answer.

Explanation:

Step1: Find the radius

The radius $r$ of a circle is half of the diameter $d$. Given $d = 18$ in, so $r=\frac{d}{2}=\frac{18}{2}=9$ in.

Step2: Calculate the area

The formula for the area $A$ of a circle is $A=\pi r^{2}$. Substitute $r = 9$ in and $\pi=3.14$ into the formula, we get $A = 3.14\times9^{2}=3.14\times81 = 254.34$ in².

Answer:

254.34 in²