WAEC Mathematics 2015 Objective — Question 13
Question 13 of 50 from the West African Examinations Council (WAEC) Mathematics 2015 Objective paper, with the correct answer and a full explanation.
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The volume of a cone of height 3 cm is 38⅓ cm³. Find the radius of its base. [Take π = 22/7]
- A. 3.0cm
- B. 3.5cmCorrect
- C. 4.0cm
- D. 4.5cm
Explanation
V=(1/3)πr²h → 38.33=(1/3)(22/7)r²(3) → r²=38.33×7/22=12.2, r=√12.25=3.5cm.
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