IIT JEE , AIEEE Forum - Mathematics , Analytical Geometry

Discussion Response Post to: surface area of a sphere

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8 Mar 2007 17:58:56 IST

Subject: Re:surface area of a sphere

karthik_abiram (1222)

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hey umang,

thanks for pointing my mistake..i have a small doubt in yours

you have said that 2

[r²/2 + r ]^R₀

This is equal to 3

R²

how?

i thought this was equal to

[R²/2+R]

R²+2

how can this be equal to 3

R²?

further

_{[0 ]}^{[R ]} 2

(r+dr) =_[0_]^[R^]2

r+_[0_]^[R^]2

_[0_]^[R^]2

r ---has no integrator

please kindly correct me if i am wrong

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this reply: 5 points (with 1 Olaaa!! Perrrfect answer.

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