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Railways PYQCBT 1 2020

RRB NTPC · Question 3

The side of an equilateral triangle ABC is 28 cm. Find the side of another equilateral PQR whose area is 16 times the area of triangle ABC.

  1. 122 cm

  2. 112 cm

  3. 56 cm

  4. 102 cm

Show answer & explanation

Answer: (B) 112 cm

Explanation

Areas of similar figures are in the ratio of the squares of their sides. 16 times the area means 4 times the side: 4 × 28 = 112 cm.