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alexdok [17]
2 years ago
10

What is the surface area of this right circular cone?

Mathematics
1 answer:
docker41 [41]2 years ago
3 0

Answer:

○ B) 624π mm.²

Step-by-step explanation:

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

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