Find the total surface area of a cone, if its slant height is 21 m and diameter of its base is 24 m.

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Solution

Given,
Radius (r) of the base of cone == 12 m
Slant height (l) of cone = 21 m
Total surface area of cone = πr(r + l)

Hence, total surface area of the cone $1244.57 m^{2}$

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