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Volume and Surface Area - General Aptitude

Q1:

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

A 30 m2

B 40 m2

C 60 m2

D 80 m2

ANS:C - 60 m2

l = 10 m, h = 8 m. So, r = l2 - h2 = (10)2 - 82 = 6 m.  Curved surface area = rl = ( x 6 x 10) m2 = 60 m2.