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DEFINITIONS and GLOSSARY Graph paper: paper with small ruled squares, used in math classes Natural number: one of the numbers 0, 1, 2, 3… Integer: one of the numbers … -3, -2, -1, 0, +1, +2… Rational number: a number that can be written as a fraction a/b, where a and b are integers Even number: an integer that is divisible by 2 Odd number: an integer that is not divisible by 2 Naught (or nought, pronounced as “not”): the British word for "zero”. It is often used to indicate 0 subscripts, so would be spoken as " naught." Straight line: a line with no curvature or angles Isosceles triangle: a triangle with two equal sides Right angle: an angle formed by two perpendicular lines; a 90o angle Right triangle: a triangle that contains a right angle; a right triangle has a hypotenuse and two legs Midpoint: the point that divides a line segment into two congruent parts Median: the line segment extending from a vertex of a triangle to the midpoint of the opposite side Altitude: the line segment from one vertex of a triangle that is perpendicular to the opposite side Angle bisector: a straight line that divides an angle into two congruent angles Perpendicular bisector of a segment AB: the line perpendicular to the segment at its midpoint. The perpendicular bisector of a line segment AB is the set of all points in a plane that are equidistant from the endpoints A, B. Point-slope equation: a line with a slope m passing through a known point (x0, y0) has the equation y – y0 = m(x-x0) slope-intercept equation: y = mx + q Parabola: the set of all points in a plane which are equidistant from a fixed point F, called the focus, and a fixed line d (not containing F), called the directrix. Axis of symmetry of a parabola: the line through the vertex perpendicular to the directrix quadratic equation: ax2 + bx + c = 0 to solve a quadratic equation we use the quadratic formula solution to a system of equations to sketch the graph of a curve; to graph a curve or a function x – axis y – axis symmetric with respect to