I.
Properties of triangles
1.
isosceles triangle
2.
Circumcenter and incenter of a triangle

II.
Properties of a square
1.
parallelogram
2.
Various squares

III.
Similarity of Figures and the Pythagorean Theorem
1.
Similarity of shapes
2.
Ratio of the lengths of parallel lines and line segments
3.
center of gravity of a triangle
4.
Pythagorean theorem

IV.
probability
1.
Number of cases
2.
probability