lng3313
surface area of a cone? 12cm high and radius is 5
answer options are
90 pi
65pi
120pi
115pi



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motex
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90 pi

amistre64
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or.... pi(r) sqrt(r^2 + h^2)

amistre64
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5pi sqrt(169)
5*13pi = 65pi

amistre64
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its either that or 90; i cant recall if surface area includes the base area or not

a_kaffash
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90!

lng3313
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[Base Area] + 1/2 × Perimeter × [Slant Length]