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CBSE Class 10 Answered

plz answer soon tomorrow is exam plzzzzzzzzzzz
Asked by BhavSimran | 10 Mar, 2010, 12:05: PM
answered-by-expert Expert Answer

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.

Answered by | 10 Mar, 2010, 03:50: PM

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