A right circular cone has a base radius of 5 cm and a height of 12 cm. What is its lateral surface area?
Answer and explanation
Correct answer: D. 65pi cm^2
- Step 1: Slant height l = sqrt(r^2 + h^2) = sqrt(5^2 + 12^2) = sqrt(25 + 144) = 13 cm. Step 2. Lateral area = pi r l = pi 5 13 = 65pi cm^2. Answer: 65pi cm^2. Why not the others: 60pi uses height 12 instead of slant height 13.
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