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- What is the total surface area of a right circular cone of height 14 cm and base radius 7 cm?
Question 1:
What is the total surface area of a right circular cone of height 14 cm and base radius 7 cm? A. 344.35 sq.cm
B. 462 sq.cm
C. 498.35 sq.cm
Feedback h = 14 cm, r = 7 cm.
So, l =[√7^2+14^2] = √245 = 7√5cm
Total surface area = πrl+πr2 = 22/7 × 7 × 7√5 + 22/7 × 7 × 7
= 154 (V5 + 1)
= (3.236 x 154) sq.cm
= 498.35 sq.cm
So, l =[√7^2+14^2] = √245 = 7√5cm
Total surface area = πrl+πr2 = 22/7 × 7 × 7√5 + 22/7 × 7 × 7
= 154 (V5 + 1)
= (3.236 x 154) sq.cm
= 498.35 sq.cm
D. None of these
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