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WAEC Mathematics 2025 Question 13

Question 13

Mensuration of Plane Shapes

A square has diagonal length of 10 cm. Find the perimeter of the square.

  1. A.10√2 cm
  2. B.15√2 cm
  3. C.20√2 cm
  4. D.25√2 cm
Show the answer and explanation

Answer: C (20√2 cm)

Explanation

Side² + side² = 100, so side = √50 = 5√2 cm and perimeter = 4 × 5√2 = 20√2 cm.