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ICSE Class 10 Answered

A sector of radius 35cm is cut out of a thin cardboard with angle 180 degree. It is folded I to a cone of maximum size. Find the curved surface and the volume of the cone. π=22/7
Asked by Pankaj | 30 Sep, 2018, 10:13: PM
answered-by-expert Expert Answer
It is a semicircle R =35
so curved surface area = area of semi-circle
=1/2×pi×R2
Also,
pi×r×l=1/2×pi×R2
slant height l = 35.....same as R
Find r,
then h by l2 = r2+h2
sub below,
volume of cone is  = 1/3×h×pi×r2 

Answered by Arun | 01 Oct, 2018, 12:11: PM

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