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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. 



Answer -

Slant height of a cone (l) = 21 m
and diameter of its base = 24 m
∴ Radius (r) = 24/2 = 12 m
Now total surface area = πr(l + r)

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