The ratio of radius of a circle and the side of a square is 2 : 9. Find the ratio of their areas: Choose the correct answer
A) 2 : 1 B) 4 : 7 C) 8 : 77 D) 4 : 81 E) None
radius/side = 2/9   â‡’ area of circle/area of square= 4/81   Answer: 4 : 81
<result>D</result>
The ratio of radius of a circle and the side of a square is 2 : 9. Find the ratio of their areas: