mathinschool.com
numbers and algebraic expressions
logic, sets, intervals
absolute value
function and its properties
linear function
quadratic function
polynomials
rational function
exponential function
logarithm
number sequences
limits of sequences and functions
derivative and integral of functions
trigonometry
plane geometry
analytic geometry
solid geometry
combinatorics
probability
elements of statistics
kropki game
The exterior of a circle (no common points). d gt; r. d - distance between the line and the center of a circle O. r - radius of the circle. The secant of a circle (two common points). d < r. The tangent of a circle (A - point of tangency). d = r. The angle between the radius of a circle and tangent is right. Two tangents to a circle.