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In DeltaABC and DeltaDEF, AB=DE,AB||DE, ...

In `DeltaABC and DeltaDEF, AB=DE,AB||DE, BC=EF and BC||EF` Vertices A,B and C are joined to vertices D , E and F respectively show that
quadrilateral ABED is a parallelogram
quadrilateral BEFC is a parallelogram
`AD||CF and AD=CF`
quadrilateral ACFD is a parallelogram
AC=DF
`DeltaABC approx DeltaDEF`.

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