Diameter of the base of a
cone is 9.9 cm and its slant height
is 9 cm. Find its curved surface
area.
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Given :- diameter of base of a cone (D) = 9.9cm
:- slant height of a cone = 9cm
:- radius of cone = D/2 = 9.9/2 = 4.95 cm
to find:-. curved surface area of cone
solution:-
= curved surface area of cone = 2πr + πrl
=2×22/7 + 22/7×4.95×9
=6.28 + 3.14×4.95×9
=6.28 + 139.88
=146.16 cm*2
= curved surface of cone = 146.16 cm*2
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