Theorem 5: One Pair of Opposite Sides Parallel and Equal
Question 11 i...
Question
Question 11 (ii) In ΔABC and ΔDEF ,AB=DE, AB || DE, BC =EF and BC || EF. Vertices A, B and C are joined to vertices D,E and F respectively ( see the given figure). Show that Quadrilateral BEFC is a parallelogram.
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Solution
BC = EF and BC || EF Since a pair of opposite sides is equal and parallel, therefore, the quadrilateral BEFC is a parallelogram.