A cone is made from a sector of circle of radius 14cm and angle of 90o. What is the area of the curved surface of the cone? (Take x = 22/7)
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Correct Answer: Option D
Explanation:
Length of arc =
θ/360
* 2πr
=> r =
90/360
*
14/4
= 3.5
slant height t = 14cm
curved surface area of cone = πrl
=> 3.142 x 3.5 x 14 = 153.95
Length of arc =
θ/360
* 2πr
=> r =
90/360
*
14/4
= 3.5
slant height t = 14cm
curved surface area of cone = πrl
=> 3.142 x 3.5 x 14 = 153.95