# using neutral geometry, prove that If one angle of a triangle is right or obtuse, then the other two angles are acute. (Note: You may not use the statement “The sum of the angles in a triangle is 180”, since this statement is equivalent to Euclid’s 5th postulate and therefore cannot be proved from the axioms of neutral geometry.)

using neutral geometry, prove that If one angle of a triangle is right
or obtuse, then the other two angles are acute. (Note: You may not use the statement “The sum of the angles in a triangle is 180”, since this statement is equivalent to Euclid’s 5th postulate and therefore cannot be proved from the axioms of neutral geometry.)

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The post using neutral geometry, prove that If one angle of a triangle is right or obtuse, then the other two angles are acute. (Note: You may not use the statement “The sum of the angles in a triangle is 180”, since this statement is equivalent to Euclid’s 5th postulate and therefore cannot be proved from the axioms of neutral geometry.) appeared first on Superb Professors.