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Prove, by simple congruence theorems (which do not require the parallel postulate), the following theorems about isosceles birec tangles:If perpendiculars are drawn from the extremities of the base of a triangle upon the line passing through the midpoints of the two sides, an isosceles birectangle is formed.

Prove By Simple Congruence Theorems Which Do Not Require The Parallel Postulate The Following Theorems About Isosceles Birec TanglesIf Perpendiculars Are Drawn class=