Question

A circle has an area of 155 square feet. What is the approximate radiusof the circle?A. 50 feetB. 25 feetC. 14 feetD. 7 feet

Answer 1

To solve this question, we should know the formula for calculating the area of the circle.

`Area=\pi r^2`
`\begin{gathered} \text{Area}=155ft^2 \\ 155=3.14* r^2 \\ (155)/(3.14)=r^2 \\ 49.3631=r^2 \\ \text{Take the square root of both sides} \\ \sqrt[]{49.3631}=\sqrt[]{r^2} \\ 7.026=r \\ 7\text{ f}eet\text{ =r} \end{gathered}`

The approximate radius of the circle is 7 feet.

The correct option is D.