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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: angle bisectorss..
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[Post New]4 Nov 2007 23:54:45 IST
    Subject: angle bisectorss..
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little_genius (295)

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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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[Post New]5 Nov 2007 13:23:26 IST
    Subject: angle bisectorss..
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venkat_tatolu (228)

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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'
***T.Venkat***
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