Important Problems – Quadrilateral – In Δ ABC and Δ 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

In Δ ABC and Δ 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