1.

If (x)/(a)=(y)/(b)=(z)/(c) then xy+yz+zx is equal to :

Answer»

`(a+B+c)^2//x^2+y^2+z^2`
`x^2(a+b+c)^2-a^2(x^2+y^2+z^2)//2a^2`
`ax+by+cz//(a+b+c)^2`
NONE of these

Answer :B


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