An ice cream cone has radius of 21 m and height of 20 m. Find total surface area of the cone.
3297m2
9734cm2
3297mm
3297m
A
3297m
B
3297m2
C
9734cm2
D
3297mm
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Solution
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Given, radius r=21m and height h=20m.
Then, slant height is: s2=h2+r2 ⟹s2=202+212 ⟹s2=400+441 ⟹s=√841 ⟹s=29 m.
Therefore, Total surface area of a cone =πrs+πr2 =3.14×21×29+3.14×21×21 =1912.26+1384.74 =3297m2.
Hence, option A is correct.
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