Question
Wed March 10, 2010 By: Bhav Simran Kaur

plz answer soon tomorrow is exam plzzzzzzzzzzz

Expert Reply
Wed March 10, 2010

let angle C be acute, or obtuse.

draw AD perpendicuar to BC(or BC produced if necessary)

Now,

cosC =CD/CA

So

CD=CA cosC

let a=BC

b=CA

c=AB

then we get,

from this we can get the required result.

 note that going along  similar lines we can prove the result even if C is an obtuse angle.

Sun March 26, 2017

solve

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