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Analytical Geometry

Cool goIITian

Joined:	9 Sep 2007
Post:	39

22 Oct 2007 15:13:28 IST

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498

answer the question

None

prove that the area of

whose vertices are (acosp_r,bsinp_r);=1,2,3is equal to 2absin1/2(p₁-p₂).sin1/2(p₂-p₃).sin1/2(p₃-p₁)

hence prove that no three distint points of the above type can be collinear.

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Comments (2)

dibyasingh jagaddev

Cool goIITian

Joined: 19 Aug 2007

Posts: 50

24 Oct 2007 20:38:52 IST

Like 1 people liked this

no one there to answer.

puneet

Forum Expert

Joined: 19 Oct 2006

Posts: 1966

24 Oct 2007 22:03:10 IST

Like 0 people liked this

hii

this is simple enough ..

just write the area of the triangle .. using these points.

use the matrix to wirte the area .. and then open the matrix ... and do simple trignometric manipulations .. u will get the answer easily ..

cheers

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