WAEC Mathematics 2017 Objective — Question 39
Question 39 of 50 from the West African Examinations Council (WAEC) Mathematics 2017 Objective paper, with the correct answer and a full explanation.
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The diagonal of a square is 60cm. Calculate its perimeter
- A. A. 20√2
- B. B. 40√2
- C. C. 90√2
- D. D. 120√2Correct
Explanation
For a square with diagonal d and side x: d^2=2x^2 → 3600=2x^2 → x^2=1800 → x=30√2. Perimeter=4x=4(30√2)=120√2cm.
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