Question

What is the surface area of this right circular cone?

Answer 1

○ B) 624π mm.²

Explanation:

`\pi r(r + \sqrt{ {r}^(2) + {h}^(2)}) = S. A. \\ \\ \pi (12)(12 + \sqrt{{12}^(2) + {40}^(2)}) \\ \\ 12\pi(12 + √(1744)) = 12\pi(12 + 38) = 12\pi(50) = 600\pi \\ \\ 600\pi ≈ 624\pi`

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