The area of a rhombus is 54 square cm. One of the diagonal is 9 cm. What is the length (in cm) of the other diagonal?
Show answer & explanation
Correct answer: C
Explanation
Area of the rhombus = 54 sq cm
One diagonal = 9 cm
Second diagonal = ?
Area of the rhombus = 1/2 × d₁ × d₂
54 = 1/2 × 9 × d₂
d₂ = (54 × 2) / 9
d₂ = 108 / 9 = 12 cm