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If a triangle and a parallelogram are on the same base and between thesame parallels, then prove that the area of the triangle is equal to half the area of the parallelogram.

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Triangle and parallelogram with the same base and parallels.
When a triangle and a parallelogram lie on the same base and have the same parallels, the triangle's area is half that of the parallelogram.
In the figure, parallelogram `ABCD` and triangle `ABD` are on the same base `AB` and between the same parallels `AF` and `DC`.
`sf "area of" ABD=1/2​ sf "area of parallelogram" ABCD`
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