A B C D is a parallelogram. L and M are ...

`A B C D` is a parallelogram. `L` and `M` are points on `A B` and `D C` respectively and `A L=C Mdot` prove that `L M` and `B D` bisect each other.

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AL=CM
AB-BL=CD-DM
-BL=-DM
BL=DM
NOW, AB||CD and traversal BD and LH
`/_3=/_4` and `/_1=/_2`
`In /_OBL and /_OMP`
`/_1=/_2`
...

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