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Question
Find the total surface area of a cone, if its slant height is 21 m and diameter of its base is 24 m.
`["Assume "pi=22/7]`
Solution
Radius (r) of the base of cone = `(24/2)m` = 12 m
Slant height (l) of cone = 21 m
Total surface area of cone = πr(r + l)
= `[22/7xx12xx(12+21)] m^2`
= `(22/7xx12xx33) m^2`
= `8712/7 m^2`
= 1244.57 m2
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