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Q.

The formula used to find the total surface area of a cone is

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a

$π r l$

b

$π r (l + r)$

c

$\frac{1}{3} π r^{3} h$

d

$π r^{2} h$

answer is B.

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Detailed Solution

T.S.A (cone) $= π r (r + c)$

Where $l = \sqrt{r^{2} + h^{2}}$

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