WAEC Mathematics 2018 Objective — Question 14

Question 14 of 50 from the West African Examinations Council (WAEC) Mathematics 2018 Objective paper, with the correct answer and a full explanation.

The surface area of a sphere is 792/7 cm². Find, correct to the nearest whole number, its volume. [Take π = 22/7]

• A. 113cm³Correct
• B. 131cm³
• C. 311cm³
• D. 414cm³

Explanation

4πr²=792/7 → r²=9 → r=3. Volume=(4/3)πr³=(4/3)(22/7)(27)≈113cm³.

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