algebra 2 high school

Question

The formula r=√A/π relates the radius r and area a of the circle. Find the radius of the circle with an area of 450ft^2. Round your answer to nearest thousandth of a foot

Answer 1

This is just a variation of the formula for the area of a circle, which is A = πr².

 

All we need to do is substitute into the given formula.

 

Compute √(450/3.14)

 

That will give the value of the radius of the circle. Keep in mind that 450 = 225 * 2, and 225 is a perfect square.

 

√450 = 15√2