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numbers and algebraic expressions
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function and its properties
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polynomials
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exponential function
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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.