If diagonal of a square room is d, what is the area of the room?

  1. d/√2
  2. d2/2
  3. d2√2
  4. 2d2
Explanation

Answer B

Area of a square = a x a = a2 and diagonal d2 = a2 + a2 = 2 a2
Hence area = d2 /2

Key takeaway: In GMAT, word problems based on only basic geometry are asked . You should remember simple formulae of a square. and their application.
Area of square = side x side, Perimeter = 4 x sides ,Diagonal of square = a√2

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