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Railways PYQCBT 1 2020

RRB NTPC · Question 35

The area of a rectangle is 300 cm^2 and the length of its diagonal is 25 cm. The perimeter of the rectangle (in cm) is:

  1. 121

  2. 70

  3. 25

  4. 176

Show answer & explanation

Answer: (B) 70

Explanation

l² + b² = 25² = 625 and lb = 300. (l + b)² = 625 + 600 = 1225, so l + b = 35 and the perimeter = 2 × 35 = 70 cm.