Rational fractions and their properties. Square roots, properties, actions with square roots. Quadratic equations, rational equations, the theorem of vieta. Numeric inequality, their properties, solution of linear inequalities, the proof of inequalities systems of inequalities. Equations and inequalities containing the module. Degree with integer exponent and its properties. The system of equations. The image of a set of points in the plane given by the equation or inequalities (their system).
Polygon. The area of a triangle. The theorem on the intersection of the median at one point. Parallelogram, trapezoid, rhombus, rectangle, square. Their properties, characteristics, area. The Theorem Of Thales. The like. The Pythagorean Theorem. Circumference. Arc and its degree measure. Inscribed angles. The theorem on the inscribed angle. Tangent. Inscribed circle and a circumscribed circle about triangle formulas for calculating their radii, inscribed polygon, the polygon described by their properties.