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Logic Scheme of Main Results in Euclidean Geometry Basic definitions Euclid’s fifth postulate Supplements. Opposite angles. Corresponding angles, Alternate angles Parallelogram properties. Rectangle Properties. Rhombus properties. Isosceles triangles SSS SAS, ASA Congruent triangles Pythagora’s theorem Properties of angle bisectors Sum of angles in a triangle is 180 deg. Midline properties Properties of medians Centroid Incentre Properties of segment bisectors Circumcentre Properties of heights Properties of circles: angles, secants, tangents Orthocentre