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# CKS Math 9

### Math 9 Terms

Acute Angle an angle measuring less than 90 degrees
Angle of Depression the angle formed by the horizontal and the line of sight to something below the horizontal
Angle of Elevation the angle formed by the horizontal and the line of sight to something above the horizontal
Area the space within a region measured in square units
Average the mean set of numbers, found by summing all numbers in the group and dividing by the numbers of members in the group
Base the side or face of a polygon or solid from which an altitude rises
Base (of a power) the number in a power used as a factor for multiplication. In the power 9^3, the base is 9
Binomial a polynomial with exactly 2 terms
Capacity the greatest volume a container can hold
Circumference the measure of the distance around a circle (the perimeter of a circle)
Coefficient (numerical) the variable part of a term, in 13x, the numerical coefficient is 13
Coefficient (variable) the variable part of a term, in 13x, the variable coefficient is x.
Complementary Angles two angles who's sums is exactly 90 degrees
Composite Number a number with a minimum of three factors including 1 and itself
Constant a number by itself
Corresponding Angles/Sides angles and sides that have the same relative positions in two or more geometric figures
Cosine a measure in a right triangle that is the ratio of the side adjacent to the hypotenuse for either of the acute angles in the triangle
Cube a solid with six square faces
Degree Of Polynomial the highest sum of the exponents of the variables in any one term of the polynomial
Diameter the longest distance connecting two points on a circle and passing through the center
Enlargement a dilatation where the resulting image is larger then the original figure
Equilateral Triangle a triangle with all three equal sides
Exponent a symbol written above and to the right of a mathematical expression to signify how many times it is to be multiplied by itself
FOIL an acronym for first terms, outside terms, inside terms and last terms
Frequency the number of times a particular number or event occurs
Hypotenuse the side of a right triangle that is opposite to the right angle
Independent Events two or more events that are not influenced by each other
Inequality an arrangement of two expressions so that one side is greater then the other
Integers the set of numbers...-3,-3,-1,0,+1,+2,+3,...
Irrational Number numbers in decimal form that are non-terminating and non repeating
Isosceles Triangle a triangle with two equal sides
Line of Best Fit a line that passes as close as possible to the points plotted on a graph
Monomial a polynomial with only one term
Natural Numbers the set of numbers 1, 2, 3, 4, 5,...
Net a pattern that, when folded, makes there-dimensional object
Obtuse Angle an angle measuring more than 90 degrees and less then 180 degrees
Perimeter the measure of the distance around a closed figure
Pi the ratio of the circumference of a circle to its diameter, 3.14.....
Polygon a closed two-dimensional figure of three or more line segments
Polynomial a mathematical expression with one or more terms, integral exponents, and coefficients that are real numbers
Population the entire set of objects or people from which data can be taken
Power the number of times as indicated by an exponent a number is multiplied by itself
Prime Number a whole number with only two factors, itself and 1
Prism a solid formed by two congruent and parallel sides and other faces that are parallelograms
Probability a measure of how likely it is that some event will occur
Proportion two equal ratios
Pythagorean Theorem the square of a hypotenuse in a right angle triangle
Quadrant any of the four regions of the coordinate plane formed by the two axes
Quadrilateral any polygon with four sides
Radius the distance from the center of a circle to the outside
Random Number any number selected by chance
Random Sample a sample or survey in which all members of the population have an equal chance of being selected
Ratio a comparison of 2 or more quantities having similar units
Rational Number a number that can be expressed as the quotient of 2 integers where the denominator is not 0
Real Numbers the set of all rational and irrational numbers
Reduction a dilation where the resulting image is smaller than the original figure
Reflection a flip transformation in which all points of the figure and the corresponding points of its image are an equal distance from the line across which it is reflected
Relative Frequency the number of times a particular outcome occurs related the number of times the experiment is conducted
Rotation a transformation in which a figure is turned relative to a fixed point
Sample a representative portion of a given population
Sample Size the number of items selected as a sample from the entire population
Scatter Plot a collection of points on a graph that represents the data
Scientific Notation a number expressed as the product n and a power of 10
Similar Figures figures with the same shape, but not necessarily the same size or orientation
Sine opposite over hypotenuse
Supplementary Angles = 180 degrees