Question

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

Answer 1

Step-by-step explanation:

so the area of a cone is πr(l+r)

so here

r = d/2

=24/2

=12

and l= 21

so

22/7×12(12+21)

=22/7×12×33

1244.57m²

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