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Question

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

Options:
A .  498.35 sq cm
B .  498.35 sq m
C .  502.35 sq cm
D .  502.35 sq m
E .  None of these
Answer: Option B
 -  h = 14 cm, r = 7 cm.
So, l = (7)2 + (14)2 = 245 = 75 cm.
 Total surface area =22/7 (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.

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