Question

The slant height of a right circular cone is 10 m and its height is 8m. find the area of its curved surface


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Answer 1

Area=πrl

r=6 By Pythagoras Theorem

a=(22*6*10)/7

a=31.4*6

a=188.4 cm2

Answer 2

Given,

l=10m

h=8m

So,

r^2=l^2 - h^2

=10^2 - 8^2

So, r=6m

CSA=pi x r x l

=22/7 x 6 x 10

=18.8m ^2