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Volume and Surface Area - General Aptitude

Q1:

What is the total surface area of a right circular cone of height 14 cm and base radius 7 cm?

A 344.35 cm2

B 462 cm2

C 498.35 cm2

D None of these

ANS:C - 498.35 cm2

h = 14 cm, r = 7 cm. So, l = (7)2 + (14)2 = 245 = 75 cm.

 Total surface area = rl + r2
 
= 22 x 7 x 75 + 22 x 7 x 7 cm2
7 7
  = [154( 5 + 1)] cm2
  = (154 x 3.236) cm2
  = 498.35 cm2.