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angle bisector meets the base in opposite side ratio ,
so,
AB/BC = AD/DC
Now let DC = X cm
than AD = (l-X) cm
putting values ,
m/k = (l-x)/x
mx = kl-kx
mx -kx = kl
x(m-k) = kl
x = kl/(m-k) = DC = (Ans.)
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