Свойства треугольников. Теория

The basic properties of triangles, types, formulas and examples. Theory

Properties of triangles, theory:

- What is a triangle?

- Designations in a triangle

- Types of triangles by the magnitude of the angles

- Types of triangles by aspect ratio

- Basic properties of triangles

- Signs of equality of triangles

- Signs of equality of right triangles

- Similar triangles

- Signs of similarity of triangles

- Properties of similar triangles

- Similarity in right triangles

- Pythagorean theorem

- Sine Theorem

- cosine theorem

- Median

- Bisector

- The height of the triangle

- Median perpendicular

- Middle line

- Arbitrary triangle - area formulas

- right triangle - square formulas

- Equilateral (regular) triangle - area formulas

- Application of the derivative to the study of functions