The diagonal of a rectangle is √41 cm and its area is 20 sq. cm. The perimeter of the rectangle must be: Options.
A) 18	B) 28	C) 38	D) 48	E) 58

Rationale: explanation : l 2 + b 2 = 41 also , lb = 20 ( l + b ) 2 = l 2 + b 2 + 2 lb = 41 + 40 = 81 ( l + b ) = 9 perimeter = 2 ( l + b ) = 18 cm . answer : a
Answer: A