Question

In the diagram, 2 concentric circles are shown. The radius of the outer is R, and the shaded area is equal to the unshaded area. The difference in the radii of the two circles is

Answer 1

a) R/2
b) (2-sqrt(2)/sqrt(2)) R
c) (((sqrt(2)-1)/sqrt(2)) R
d) R/sqrt(2)
e) 2 + sqrt(2) / 2