A B C D is a parallelogram in which B ...

`A B C D` is a parallelogram in which `B C` is produced to `E` such that `C E=B C. A E` intersects `C D\ ` at `F`. Prove that `a r\ (\ A D F)=\ a r\ (\ E C F)`. If the area of `\ D F B=3\ c m^2,` find the area of ABCD.

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