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Prove that Parallelograms on the same ba...

Prove that Parallelograms on the same base and between the same parallels are equal in area.

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area of parallelogram =b*h
`MN_|_AB`
area of parallelogram ABCD=AB*MN-(1)
area of parallelogram ABEF=AB*MN-(2)
area of parallelogram ABCD= area of parallelogram ABEF.
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