- History Of Math 2022Pythagoras Sum Of Angles In A TriangleEuclid I. 32 Sum Of Angles In A TriangleEuclid I 32 Exterior angle theoremThales TheoremConstruct An Equilateral TriangleConstruct A Midpoint / Perpendicular BisectorConstruct An Angle BisectorEuclid VI. 9 Divide a segment into n equal piecesEuclid II. 14 Squaring A Rectangle