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

• Height =14, Radius= 7cm
  
  L=√h^2 + R^2
  = √245= √5*49
  = 7√5
  
  Area = ╥rl +╥r^2
  
  = ╥r(l+r)
  
  =22/7 *7 (7√5+7)
  = 22(7(2.2360)+7)
  =22(22.652)
  =498.35 cm^2
  
  
  
  
  
  
  
• 8 years agoHelpfull: Yes(1) No(0)
• 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.
• 8 years agoHelpfull: Yes(0) No(1)