An introduction to Euclid

Interesting Propositions
Definitions
Axioms and Postulates
Other
Propositions and Constructions
4. Congruent triangles (1) side-angle-side 5. Isosceles triangle base angles are equal (Pons Asinorum) 8. Congruent triangles (2) three sides 15. Opposite angles are equal 18. In triangle, greater angle is opposite greater side 20. In triangle, sum of two sides greater than third 26. Congruent triangles (3) side and two angles 29. Parallel lines makes angles equal 32. Angles of a triangle add up to 180° 34. Parallelograms have the opposite sides and angles equal 36. Parallelograms on equal bases and between the same parallels are equal area 47. Pythagoras' theorem
Interesting Constructions
1. Construct an equilateral triangle on a given line 9. Bisect an angle 11. Construct a right angle at a point on a line 31. Construct a parallel line through a point