The length of one side of a rhombus is 41 cm and its area is 720 cm2. What is the sum of the lengths of its diagonals?

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RRB ALP Previous Paper 6 (Held On: 13 Aug 2018 Shift 1)
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  1. 82 cm
  2. 90 cm
  3. 98 cm
  4. 80 cm

Answer (Detailed Solution Below)

Option 3 : 98 cm
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Area of Rhombus = 1/2 × product of diagonals

⇒ 720 = 1/2 × product of diagonals

⇒ Product of diagonals = 1440

(Side of rhombus)2 = (half of one diagonal)2 + (half of the other diagonal)2

⇒ (One diagonal)2 + (Other diagonal)2 = 41 × 41 × 4

(Sum of two diagonal)2 = (One diagonal)2 + (other diagonal)2 + 2 × product of diagonals

⇒ (Sum of two diagonal)2 = 6724 + 2880 = 9604

∴ Sum of two diagonal = 98cm
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