11. In À ABC and A DEF, AB = DE, AB || DE,
BC = EF and BC || EF. Vertices A, B and C are
joined to vertices D, E and F respectively (see
Fig. 8.22). Show that
(i) quadrilateral ABED is a parallelogram
(ii) quadrilateral BEFC is a parallelogram
(iii) AD || CF and AD = CF
(iv) AC = DF
(v) A ABC = A DEF.
rium in which AB CD and
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