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yatin kaushik

· started a discussion

· 1 Months ago

wrong (Question: 259981.0 )

base area should not be taken because from the sector of a circle only a hollow cone can be made if you are not cutting the sheet any further. So area of the base is irrelevant. Although i knew that there is gonna be an issue about this in the question yet i didn't add the area of the base.

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)

  

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