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Q.

The slant height of a cone of radius 21 cm and height 28 cm is

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a

$\sqrt{10} c m$

b

35 cm

c

32 cm

d

16 cm

answer is A.

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Detailed Solution

r = 21 cm , h = 28 cm

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

$l = \sqrt{21^{2} + 28^{2}} = 35 c m$

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