The slant height of a right circular cone is 10 m and its height is 8 m. Find the area of its curved surface.
A.30โ m2
B.40โ m2
C.60โ m2
D.80โ m2
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A≈301.59m²
h Height

m
l Slant height

m
Using the formulas
A=πrl+πr2
l=r2+h2
Solving forA
A=π(l2﹣h2+ll2﹣h2)=π·(102﹣82+10·102﹣82)≈301.59289m²
h Height

m
l Slant height

m
Using the formulas
A=πrl+πr2
l=r2+h2
Solving forA
A=π(l2﹣h2+ll2﹣h2)=π·(102﹣82+10·102﹣82)≈301.59289m²
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