The ratio of radius of a circle and the side of a square is 2 : 7. Find the ratio of their areas:  Choose the most appropriate option:
A) 2 : 1
B) 4 : 7
C) 8 : 77
D) 4 : 49
E) none

Rationale: "radius / side = 2 / 7 â ‡ ’ area of circle / area of square = 4 / 49 answer : d"
Answer: D