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

We have,

Slant height of cone(l ) = 21 m

Radius of cone ( r )= 12 m

Total surface area = πr2+ πrl= πr(r+l)

= ×12(12+21) m2

=×12×33 cm2=1244.57 m2

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