The perimeter of a rhombus is 52 units. One of its diagonal is 24 units. What is its second diagonals length? Choose the most appropriate option.
A) 5	B) 10	C) 15	D) 20	E) 25

Rationale: when the perimeter of a triangle is 52 units each side is 13 units next , the diagonal of a rhombus bisect each other at 90 degree thus the half of the diagonal is 12 units now in a right angle triangle so formed , the perpendicular is 12 and the hypptenuse is 13 ( that is the side of the triangle ) finding the base ( which is half of the other diagonal ) : 13 ^ 2 - 12 ^ 2 = 25 thus half of the diagonal is 5 and the diagonal is 10 units answer : b
Answer: B