Question

What is the radius of a circle with an area of 78.5 cubic inches? Use 3.14 for pi.

Answer 1

Answer: 5 inches

Explanation:

1. To solve this problem you must use the formula for calculate the area of a circle, which is shown below:

`A=3.14r^(2)`

Where
`r` is the radius of the circle.

2. You know the area of the circle, therefore, you can solve for the radius, as following:

`r^(2)=(A)/(3.14)\\r=\sqrt{(A)/(3.14)}`

3. When you must substitute the value of the area into the equation above, you obtain the following result:

`r=\sqrt{(78.5in^(2) )/(3.14)}\\r=5in`