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Analytical Geometry

Blazing goIITian

Joined:	30 Sep 2007
Post:	361

4 Nov 2007 23:54:45 IST

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351

angle bisectorss..

None

how to find whetrher a given bisector of an angle b/w 2 st . lines is acute or obtuse??

how the relation a1a2 + b1b2 > or < 0 is obtained regarding acute or obtuse angle bisectors??

plzz plzz clr my doubt.......

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venkat v.t

Scorching goIITian

Joined: 7 Aug 2007

Posts: 244

5 Nov 2007 13:23:26 IST

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good question little_geneious.

If x is the angle between the given lines.

Then Cosx=(a1 a2+b1 b2)/squrt of (a1^2+b1^2) squre root(a2^2+b2^2)

If x is acute angle 'numerator is greaterthan zero'

If x is obtuse angle 'numerator is less than zero'

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