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2014-09-16T18:56:01+05:30

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BCD forms an right angled triangle.
So according to pythogoros theorem,
BCsq=BDsq+CDsq
BCsq-BDsq = CDsq
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sorry i only knew the ans not the method that's y i asked the question
plz do ask
ok
and tell me also
sorry ya i tried but cant