The diagonals of the two squares are in the ratio of 7:9 find the ratio of their area
Choose the correct answer
A) 78 : 89	B) 5 : 48	C) 49 : 81	D) 74 : 36	E) 25 : 49

Rationale: let the diagonals of the square be 7 x and 9 x respectively . ratio of their areas = 1 / 2 ( 7 x ) ^ 2 : 1 / 2 ( 9 x ) = 49 x ^ 2 : 81 x ^ 2 = 49 : 81 answer ( c )
Answer: C