Question

Michelle found the area of a circle as 78.5 〖in〗^2. She used 3.14 for π. What is the radius of the circle? Explain how you found your answer.

Answer 1

r = 5 inches

Explanation:

Area of circle,
`A=78.5\ in^2`

It is required to find the radius of the circle. The area of a circle is given by the formula :

`A=\pi r^2`

r is radius of the circle

`r=\sqrt{(A)/(\pi)} \\\\r=\sqrt{(78.5)/(3.14)} \\\\r=5\ \text{inch}`

So, the radius of the circle is 5 inches.