Question

calculate the total surface are of a cone if it's slant height is 21m and radius is 12m​

Answer 1

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Answer 2

Solution

Given

Slant height = 21 m

radius. = 12m

We know that ,

T.S.A of cone = πr (r+l)

Calculation

πr(r+l)

$\frac{22}{7} \times 12(12 + 21)$

$\frac{22}{7} \times 12 \times 33$

1244.57 m² is the total surface area of cone