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D and E are the mid-points of the sides ...

D and E are the mid-points of the sides AB and AC respectively of `DeltaABC`. DE is produced to F. To prove that CF is equal and parallel to DA, we need an additional information which is

A

`/_DAE=/_EFC`

B

`AE=EF`

C

`DE=EF`

D

`/_ADE=/_ECF`.

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  18. The diagonals AC and BD of a parallelogram ABCD intersect each other a...

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