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11.  In the given figure, AB || PQ. Find the values of x and y.




















               12.  In the given figure, AB || CD and EF || GH. Find the values of x, y, z and t.




















               13.  In the given figure, AB || CD and a transversal t cuts them at E and F respectively.
                     If EG and FG are the bisectors of ∠BEF and ∠EFD respectively, prove that ∠EGF
                     = 90 0






















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