What is the total surface area of a cone if its diameter =1 ft and slant height = 12 ft. (use π=3.14).
18.625ft2
19.625ft2
11.625ft2
19.625ft
A
11.625ft2
B
19.625ft2
C
18.625ft2
D
19.625ft
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Solution
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Given, diameter, d=1 ft.
Then, radius r=d2=12 ft.
Therefore, surface area of a cone =πrs+πr2 =3.14×12×12+3.14×12×12 =18.84+0.785 =19.625ft2.
Hence, option C is correct.
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