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Theorem 9.1 : Parallelograms on the same...

Theorem 9.1 : Parallelograms on the same base and between the same parallels are equal in area.

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Since opposite sides of parallelogram are equal,
`AD||BC` with transversal `AB`
`/_DAB=/_CBF` (Corresponding angles)
And, `AD=BC` (opposite sides of parallelogram are equal)
In `/_\AED` and `/_\BFC`
`/_DEA=/_CFE`
`/_DAB=/_CBF`
...
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