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nemish sahu

· started a discussion

· 1 Months ago

1 (Question: 259981.0 )

in place of 2.pi.r it should be pi.r.l

Question:

A cone is made of a sector of circle of radius 21 cm and angle is 60ยบ. What is the total surface area of cone (in  cm2   )?

Options:
A)

269.5

B)

308

C)

312.5

D)

231

Solution:

Ans: (a)

  

Ravindra singh rathore

· commented

· 1 Months ago

It is correct. Circumference of sector = Circumference of base of cone
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