A cone is made from a sector of a 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

Correct Answer: Option D

**D. 154cm2**

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

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