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)

A.

22cm2

B.

38.5cm2

C.

77cm2

D.

154cm2

E.

308cm2

View answer & explanation

Correct answer is D

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

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