Section existential_triangle_rah.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma existential_triangle__rah : postulate_of_existence_of_a_triangle_whose_angles_sum_to_two_rights -> postulate_of_right_saccheri_quadrilaterals.
End existential_triangle_rah.