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In figure, If LM || CB and LN || CD, pr...

In figure, If LM || CB and LN || CD, prove that `(A M)/(A B)=(A N)/(A D)`.

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In`/_ABC` LM||BC
`(AM)/(MB)=(AL)/(LC)-(1)`
In`/_ACD` LN||CB
`(AC)/(LC)=(AN)/(ND)-(2)`
`1+(AM)/(MB)=1+(AN)/(ND)`
`(AM+MB)/(AM)=(AN+ND)/(AN)`
`(AB)/(AM)=(AD)/(AN)`
`(AM)/(AB)=(AN)/(AD)`
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