The ratio of radius of a circle and the side of a square is 2 : 9. Find the ratio of their areas:
Select the correct option:
A) 2 : 1
B) 4 : 7
C) 8 : 77
D) 4 : 81
E) none

Rationale: "radius / side = 2 / 9 â ‡ ’ area of circle / area of square = 4 / 81 answer : d"
Answer: D