1. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. adjacent angle Angles immediately next to each other Angles 1 and 2 are adjacent angles

2. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. adjacent side Sides immediately next to each other

3. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. alternate exterior angle When two lines are crossed by another line (which is called the Transversal), the pairs of angles on opposite sides of the transversal but outside the two lines are called Alternate Exterior Angles Angles 1 and 2 are alternate exterior angles

4. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. alternate interior angle When two lines are crossed by another line (which is called the Transversal), the pairs of angles on opposite sides of the transversal but inside the two lines are called Alternate Interior Angles Angles 1 and 2 are alternate interior angles

5. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. angle bisector A line that splits an angle into two equal angles Angle bisector

6. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. average salary The amount of money that person in a particular profession makes

7. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. axis The horizontal and vertical number lines used in a coordinate plane system.

8. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. axis of symmetry A line that cuts an object in half so that the two halves are mirror images of each other

9. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. bisector A line that cuts something (like an angle) in half

10. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. central angle An angle in a circle with its corner in circle's center

11. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. circular Having the shape of a perfect circle, or resembling a circle in shape This cake is circular

12. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. collinear Three or more points lie on the same straight line

13. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. commission A fee paid based on a percentage of the sale made by an employee or agent, separate from regular payments of wages or salary Larry works at a furniture store. For every couch he sells, Larry gets $100 in commission. So, if Larry sells 7 couches this month, he will get $700 in addition to his regular wages.

14. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. complementary angle Two angles that add up to equal 90°

15. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. conclusion A statement that follows logically from other facts 2 added to 3 equals 5 3 subtracted from 5 equals 2 So, 2 subtracted from 5 would equal 3

16. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. congruent triangle Triangles that are exactly the same size

17. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. construction The process of building something

18. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. converse Switching the hypothesis and conclusion of a conditional statement ("If… then…" statement) If Sammy has 4 points, then Jared has 6 points. If Jared has 6 points, then Sammy has 4 points.

19. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. coordinate plane The plane formed by the x-axis and the y-axis

20. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. correlation The degree to which two variables are related On a scatterplot, the closer together the points are, the higher the correlation. If the points are scattered far from one another, the correlation is less.

21. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. cosecant For a given angle in a right triangle, a trigonometric function equal to the length of the hypotenuse divided by that of the side opposite the angle hypotenuse adjacent side opposite side

22. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. cosine In a right angled triangle, the cosine of an angle is: The length of the adjacent side divided by the length of the hypotenuse. The abbreviation is cos

23. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. counterexample An example which disproves a proposition Example: All prime numbers are odd. But, 2 is a prime number. This is a counterexample.

24. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. decagon A polygon with 10 sides

25. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. depreciate The decrease in value of assets In 2009, this car was worth $23,000 In 2012, it had depreciated to $12,000

26. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. domain All the values that go into a function

27. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. empty set A set with no elements, also called null set

28. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. equation of a line Various equations that represent a line. In all equations, slope is represented by m, the x-intercept by a, and the y-intercept by b. Slope intercept from (equation of a line):

29. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. equiangular triangle A triangle with three equal angles A CB

30. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. exponential Containing, involving, or expressed as an exponent exponent

31. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. exterior angle The angle between any side of a shape, and a line extended from the next side

32. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. feet per second Expresses the distance in feet traveled divided by the time in seconds

33. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. geometric series A sequence made by multiplying some number each time Example:

34. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. heptagon A polygon with 7 sides

35. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. hexagon A polygon with 6 sides

36. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. how much A phrase asking for a total value or quantity Brad ordered 5 pizzas and still has $6 left. How much money does Brad have left after he orders the pizza? Brad has $6 left.

37. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. function table Displays the relationship between the inputs and outputs of a specific function

38. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. hyperbolic Relating to, involving, or typical of a hyperbola (a curve shaped like an arch)

39. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. hypotenuse The side opposite the right angle in a right-angled triangle Right Triangle

40. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. identity An equation that is true no matter what values are chosen.

41. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. infinite Unable to be counted, unlimited; opposite of finite This symbol represents infinite; this symbol has no start or end so it cannot be counted or measured

42. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. inscribe To draw on the inside of, touching as many points as possible.

43. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. interquartile range The difference between the upper limit for the lower quarter and the lower limit for the upper quarter Interquartile Range = Q3 – Q1

44. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. inverse Opposite in effect; the reverse of Inverse

45. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. least common multiple the smallest common multiple that two or more numbers have in common

46. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. leg Either of the legs connected to the base of a trapezoid or triangle

47. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. line symmetry Another name for reflection symmetry. One half is the reflection of the other half.

48. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. linear foot A straight line measurement of 12 inches This line is a linear foot long

49. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. linear graph A model of a straight line on the X and Y axis. It represents the equation y=mx+b.

50. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. linear pair A pair of adjacent angles formed by intersecting lines

51. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. log Abbreviation for Logarithm, How many of one number need to be multiplied to get another number

52. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. number sequence An ordered set of quantities This number sequence is a set of even quantities from 2 through 12.

53. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. opposite side The side across from the reference angle in a right triangle

54. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. perpendicular bisector The line perpendicular to a segment passing through the segment's midpoint Perpendicular bisector

55. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. point of intersection The point at which two lines intersect, or cross Point of Intersection

56. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. point symmetry A special center point for certain kinds of symmetric figures or graphs. If a figure or graph can be rotated 180° about a point P and end up looking identical to the original, then P is a point of symmetry. Point of symmetry

57. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. polynomial An expression made with constants, variables and exponents, which are combined using addition, subtraction and multiplication Example of a polynomial:

58. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. precise Exact or detailed

59. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. prime factor A factor that is a prime number. One of the prime numbers that, when multiplied, give the original number. The prime factors are circled:

60. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. Pythagorean theorem In a right angled triangle the square of the long side is equal to the sum of the squares of the other two sides.

61. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. quartile Each of the values that divide a list of numbers into quarters.

62. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. reciprocal To get the reciprocal of a number, just divide 1 by the number

63. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. rectangular area An area that has the shape of a rectangle B = 5 H = 3 Rectangular Area

64. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. regression equation A function of a particular form (linear, quadratic, exponential, etc.) that fits a set of paired data as closely as possible. The regression equation:

65. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. regular pentagon A pentagon where all angles are equal and all sides are equal

66. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. regular hexagon a hexagon with six sides of equal length

67. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. representative sample A small sample of something that accurately represents an entire group Example: Amanda and Kyle conducted surveys to estimate how many students in their school would attend a student production of Fiddler on the Roof. They gave the survey to 75 random students. Giving the survey to 75 random students gives them the best idea of what every student at their school would think. This is a representative sample because their sample represents all of the students in their school.

68. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. right cylinder A cylinder that has centers of the bases that are aligned directly one above the other

69. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. right pyramid A pyramid that has an axis perpendicular to its base

70. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. rotational symmetry The shape can be rotated some amount and is still the same

71. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. semi-annual Happens twice a year The drama department puts on a semi-annual play; it takes place on December 1 st and August 2 nd of each year.

72. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. semicircle Half a circle

73. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. series A series is the sum of a sequence.

74. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. sine The length of the opposite side divided by the length of the hypotenuse

75. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. slant height The diagonal distance from the apex of a right circular cone or a right regular pyramid to the base

76. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. slope-intercept form y = mx + b, where m is the slope and b is the y-intercept.

77. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. solution set Any and all value(s) of the variable(s) that satisfies an equation, inequality, system of equations, or system of inequalities. Example:

78. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. square kilometer A unit of area, equal to the area of a square with sides of one kilometer 1 kilometer (This is not the actual size of a square kilometer) 1 km 2 1 kilometer

79. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. square yard A unit of measurement using squares that measure one yard on each side 1 yard (This is not the actual size of a square yard) 1 yd 2 1 yard

80. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. squared A number that has been multiplied by itself

81. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. sum of measures The result of adding measures together. Sum of measures of angles:

82. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. supplementary Adding up to 180 degrees

83. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. supplementary angle Two Angles are Supplementary if they add up to 180 degrees.

84. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. surface area The total area of the exterior surface of a solid.

85. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. symmetric Describes a geometric figure or a graph consisting of two parts that are congruent to each other. The two sides of the triangle are symmetric

86. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. time-and-a-half rate of pay equal to one and a half times the normal rate, usually paid for overtime work Sally gets paid $12 per hour. When she works overtime, she gets paid time-and-a- half which is $18 per hour.

87. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. times table A table that shows you the results of multiplying two numbers

88. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. transversal A line that intersects two or more lines at different points. Transversal

89. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. trigonometric function The six functions sine, cosine, tangent, cosecant, secant, and cotangent.

90. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. trigonometric relationship Describes a relationship between a side and angle of a triangle

91. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. undefined If the denominator of a fraction is 0, then the fraction is undefined.

92. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. valid Having a well-founded, logical conclusion 2 added to 3 equals 5 3 subtracted from 5 equals 2 So, 2 subtracted from 5 would equal 3 These statements can be proven using mathematical equations (which are logical) so they are valid

93. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. variable a letter or other symbol that represents a number

94. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. velocity The rate of change of the position of an object. Velocity

95. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. whole All, everything, total amounts Half Whole

96. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. wider Having greater distance from side to side The orange shape is wider than the blue shape

97. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. x-axis The horizontal number line on a rectangular coordinate system. x-axis

98. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. x-coordinate The position of a point according to the x-axis

99. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. x-intercept The value of x at the point where a line or graph intersects the x-axis. The value of y is zero (0) at this point.

100. Mathematics Vocabulary - Grade 9-12 ©Partners for Learning, Inc. y-axis The value of x at the point where a line or graph intersects the x-axis. The value of y is zero (0) at this point. y-axis

101. Mathematics Vocabulary - Grade 10 ©Partners for Learning, Inc. y-coordinate The position of a point according to the y-axis Y-coordinate is the vertical distance

102. Mathematics Vocabulary - Grade 10 ©Partners for Learning, Inc. y-intercept The value of y at the point where a line or graph intersects the y-axis. The value of x is zero (0) at this point.