Question

18.
1. If the radii of circular ends of a frus-
tum of a cone are 20 cm and 12 cm
and its height is 6 cm, then the slant
height of the frustum is ....... cm.[ ]
A) 10 B) 6 C) 9 D) 8

Answer 1

Correct Option:- A) 10 centimeter .

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Answer 2

Given outer radius (R) = 20cm , inner radius (r) = 12cm , Height = 6cm , slant height (l) = ???

In a frustum ,

l^2 = (R-r) ^2 + (H)^2

=> l = √[(R-r)^2 + (H)^2]

= √[ ( 64) + (36) ] = √100 = 10cm