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Vectors

Cool goIITian

Joined:	4 Sep 2007
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18 Mar 2008 13:56:22 IST

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336

intecepts

None

if the plane has intercept a, b, c and is at a distance m units frm the point whre the 3 mutually perp axis meet each other.

then a^-2 + b^-2 + c^-2 = ?

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shridhar ramachandran

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Joined: 30 Jan 2008

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18 Mar 2008 14:34:54 IST

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ans : m^-2

dheer Bhatia

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18 Mar 2008 14:37:11 IST

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eq of plane will be x\a+y\b+z\c=1

now just use dist formula and square both sides

rate me if useful

cheers!!!

Halo

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18 Mar 2008 19:15:29 IST

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suppose the eq of plane is
Ax+By+Cz=D
now aplly the intecept conditions
then apply distance formula

jessica wakefield

Cool goIITian

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18 Mar 2008 22:40:12 IST

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still didn't understand, hash include u right.

HOW? plzzzzzz explain.

Halo

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Posts: 1537

19 Mar 2008 08:53:32 IST

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u will get x intercept when (a,0,0)
Aa+0+0=D
similarly
0+Bb+0=D
0+0+Cc=D
therrefore 1/a=A/D
similarly for others u apply then use distance formula
D=m/root of (A2+B2+C2)

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