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SANJEEV KUMAR JAISWAL

· started a discussion

· 1 Months ago

??? (Question: 259981.0 )

base area kyu liya hai ??

Question:

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

Options:
A)

269.5

B)

308

C)

312.5

D)

231

Solution:

Ans: (a)

  

Knowledge Expert

· commented

· 1 Months ago

Dear Student,

A cone have Two surface (I) curve surface (II) Base (circle)
thus total surface area is curve surface +base surface= πrl+πr2 = πr(l+r).

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