Since the smaller sector is contained in the larger one, do I understand right that you need to find the area of the larger quarter circle? For this you need to know its radius R; then its area is .
Apr 14th 2012, 01:04 PM
All i have is that the outer sqaure is 7 and the path is 2m across
so for the outer circle is it pi x 7 squared / 4
and then pi x 5 squared / 4 for the inner circle.
do you take the two numbers from each other is that your area?
then how would you work out the length of the edges on the circle is this possible?
thanks for your help
Apr 14th 2012, 01:24 PM
I only now realized that "path" from post #1 is supposed to mean a part of a ring, or annulus.
Suppose the radius of the bigger sector is R and the radius of the smaller one is r. Then the area of the quarter ring is . You are saying that R - r = 2, but unfortunately, this is not enough to determine the ring area. You also need R + r, or, equivalently, R and r separately. The only information I get from the picture is that R < 7 and r < R. So there is not enough information to find the ring area.