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

Answer 1

\[\pi r ^{2} = 1808.64\]
find r.

Answer 2

?

Answer 3

so it would be "b"?

Answer 4

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).

Answer 5

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

Answer 6

I'm having trouble understanding.

Answer 7

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

Answer 8

OH ITS 24!

Answer 9

r(adius) = square root of 576

r(adius) = 24

Answer 10

bingo!