What is the radius of a circle with an area of 78.5 cubic inches? Use 3.14 for pi. Enter your answer in the box.

Question

asked Nov 17, 2020 219k views

2 Answers

Syed Waleed · Answer 1 · 2020-11-22T14:02:57+0000

Answer: 5 inches.

Explanation:

1. You must use the formula for calculate the area of a circle, which is shown below:

A=3.14r^(2)

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

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

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

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