What is the total surface area of a cone with slant height 9 m and radius of base 6 m?
2828.6 m2
28286 m2
282.86 m2
28.286 m2
A
28286 m2
B
28.286 m2
C
2828.6 m2
D
282.86 m2
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Solution
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Slant height l=9m Radius of the base r =6m Curved surface area = πrl=227×6m×9m≈169.71m2 Aera of the base = πr2=227×6m×6m=113.14m2 Total surface area = Curved surface area + Base area =(169.71+113.14)m2=282.85 m2
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