The perimeter of a rhombus is 60 cm. One of the diagonal is 18 cm. What is the sum (in cm) of both the diagonals of the rhombus?
Show answer & explanation
Correct answer: B
Explanation
Perimeter = 60 cm
Side = 60 / 4 = 15 cm
Half-diagonals = 9 and x
15² = 9² + x²
225 = 81 + x²
x = 12
Second diagonal = 24 cm
Sum of both diagonals = 18 + 24= 42 cm