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pritesh1908

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Joined:	25 Feb 2008
Post:	3

13 Mar 2008 15:45:19 IST

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270

vectors

None

in the triangle abc c=a=8 & b=12 .E divides c internally in the ratio 1:3 then cos angle ACE:

7/8.solve

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LAMPARD

Blazing goIITian

Joined: 1 May 2007

Posts: 777

13 Mar 2008 15:49:57 IST

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CosA can be calc. directly using the formula CosA=(b²+c²-a²)/2bc...i guess it comes out to be 3/4...ohh sorry,wen i had read the ques,it was asked find CosA..
gess u didn complete it...

puneet

Forum Expert

Joined: 19 Oct 2006

Posts: 1966

24 Mar 2008 18:27:28 IST

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hii

wat do we need to find ?? if it the cos of angle ACE .. thn u can find it using the cos law .. u hav two sides and a angle knwn ..

i hope u got it . .

cheers

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