An earthquake was felt throughout a circular area of 1,808.64 square miles. What was the radius of the circular area?

A. 24 miles
B. 576 miles
C. 12 miles
D. 20 miles

Question

An earthquake was felt throughout a circular area of 1,808.64 square miles. What was the radius of the circular area? 
    
A. 24 miles
B. 576 miles
C. 12 miles
D. 20 miles

anonymous · Answer

$$\pi r ^{2} = 1808.64$$
find r.

anonymous · Answer

?

anonymous · Answer

so it would be "b"?

anonymous · Answer

area of a circle with radius r = pi*r^2
now, u're already given the area. equate that to pi*r^2 and find r (the radius).

anonymous · Answer

no. B is the value of r^2. value of radius will be the square root of that.

anonymous · Answer

I'm having trouble understanding.

anonymous · Answer

okay. lets start over. u know the formula for finding the area of a circle?

anonymous · Answer

OH ITS 24!

anonymous · Answer

r(adius) = square root of 576

r(adius) = 24

anonymous · Answer

bingo!