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11. In Δ ABC and Δ DEF, ABDE, ABI DE, BCEFand BC Il EF. Vertices A, B and C are joined tovertices D, E and F respectively (see Fig. 8.22).Show that(0 quadrilateral ABED is a parallelogram(i) quadrilateral BEFC is a parallelogram(iii) AD 11 CF and AD CF(iv) quadrilateral ACFD is a parallelogram(v) AC DFB4 |
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