# Mathematics

### Triangle

Concept of area of a plane figure. Area of a triangle

Height, and the median bisector of a triangle. Wonderful point of the triangle

Types of triangles

Cosine, sine, tangent and cotangent of an acute angle

Theorem of cosines and sine

Similarity of triangles

Interior and exterior angles of a triangle

Pythagoras' theorem

Thales' theorem. The middle line of the triangle

The relations between the sides and angles of a triangle

Signs of the triangle equality

Metric ratios in triangles