11. In Δ ABC and Δ DEF. AB-DE-ABI DE, BC-EFand BC I EF. Vertices A. B and C are joined tovertices D. E and F respectively (see Fig. 8.22).Show thatthe angó) quadrilateral ABED is a parallelogramfn) quadrilateral BEFC is a parallelogram(m) AD ICF andAD-CE(iv) quadrilateral ACFD is a parallelogram(v) AC#DF(v) Δ ABC Δ DEFecrighl angFig. 8.22other12, ARC

11. In Δ ABC and Δ DEF. AB-DE-ABI DE, BC-EFand BC I EF. Vertices A.

1.	11. In Δ ABC and Δ DEF. AB-DE-ABI DE, BC-EFand BC I EF. Vertices A. B and C are joined tovertices D. E and F respectively (see Fig. 8.22).Show thatthe angó) quadrilateral ABED is a parallelogramfn) quadrilateral BEFC is a parallelogram(m) AD ICF andAD-CE(iv) quadrilateral ACFD is a parallelogram(v) AC#DF(v) Δ ABC Δ DEFecrighl angFig. 8.22other12, ARC
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