assume ABCD is a Lambert quadrilateral with fourth angle at A and prove that ABEF is a Saccheri quadrilateral with summit line AD where the new figure is as described. Support your proof by including a figure with all of the given information indicated with the appropriate indicators but do not indicate any information you prove. a) Let F be along ray AD with DF congruent DA and E is the foot of the perpendicular from F to line BC. b) Let E be along ray BC with CE congruent BC and F is on the perpendicular ray at E with EF congruent BA.

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