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Foundations of Euclidean Geometry
Classical Foundations of Euclidean Geometry
From Chaos to Euclid
Euclid's Approach to Parallel Lines
Euclid's Foundations: The Exterior Angle Inequality Theorem
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Theorem. The measure of an exterior angle of a triangle is greater than the measure of either opposite interior angle. Proof. Given △ABC\triangle ABC△ABC, extend side BC‾\overli…
By Ahaan Rungta
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