Question
What is the total surface area of a right circular cone of height 14 cm and base radius 7 cm ?
Answer: Option C
Was this answer helpful ?
h = 14 cm, r = 7 cm , so,
`l = sqrt((7)^2 + (14)^2) = sqrt(245) = 7sqrt(5)` cm
`:.` Total surface area = `pi r l + pi r^2`
= `(22/7 xx 7 xx 7sqrt(5) + 22/7 xx 7 xx 7) cm^2`
= `[154sqrt(5 + 1)] cm^2`
= (154 x 3.236) `cm^2`
= 498 .35 `cm^2`
Was this answer helpful ?
More Questions on This Topic :
Latest Videos
Latest Test Papers
Submit Solution