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In a parallelogram A B C D ,E ,F are any...

In a parallelogram `A B C D ,E ,F` are any two points on the sides `A B` and `B C` respectively. Show that `a r( A D F)=a r( D C E)dot`

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`In/_DCE` and parallelogram ABCD
have same base between same
`ar(/_DCE)=1/2ar(ABCD)-(1)`
`In /_AOF` and parallelogram ABCD
have same base AD and between same lines
`ar(/_ADF)=1/2ar(ABCD)-(2)`
`ar(/_DCE)=ar(/_ADF)`.
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