Question
What is the total surface area of a right circular cone of height 14 cm and base radius 7 cm?
Answer: Option C
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h = 14 cm, r = 7 cm.
So, l = (7)2 + (14)2 = 245 = 75 cm.
So, Total surface area = \(\pi rl+\pi r^{2}\)
= \(\left(\frac{22}{7}\times7\times75+\frac{22}{7}\times7\times7\right)cm^{2}\)
= [154(5 + 1)] cm2
= (154 x 3.236) cm2
= 498.35 cm2.
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