63 terms

# key terms math

key terms

#### Terms in this set (...)

algorithm
a set of rules for solving a math problem with a given number of steps.
absolute value
a number's distance from zeo on the number line.
acute angle
An angle less than 90 degrees.
angle
the figure formed by two rays or line segments that have a common vertex. Angles are measured in degrees.
angle sum
the sum of all the measurements of all the interor angles of a polygon
change
to become different.
coordinate graph
a graphical representation of pairs of related numerical values that show the relationship between the independant variable (X-AXIS) and the dependant variable.(Y-AXIS)
coordinate pair
an ordered pair of numbers used to locate a point on a coordinate grid.
central angle
an angle with its vertex at the center of a circle
discount
to find the discount, you must find 20% OF 25%.
dependant variable
the variable that relies on the independant variable.
degree
a unit of measure of angles is also equal to 1/360 of a complete circle.
diagonal
a straight line connecting any two vertices of a polygon that are not adjacent.
expanded form
writing an expression as long as the (long way) sum of multiple terms.
equation
a mathematic statement that two expressions are equal.
equation, formula
are rules containing variables that represent a mathematical relationship
equilateral triangle
a triangle with three equal sides
exterior angle
an angle at a vertex of a polygon where the sides of the angle are on one side of the polygon and the extension on the other side.
factored form
writing an expression as (short way) the product of factors.
integers
Whole numbers and their opposites
independant variable
one of the two varables in a relationship. its value determines the value of the other variable called the dependant vaiable.
interior angle
the angle inside two adjacent sides of a polygon
irregular polygon
A polygon with sides that are not all congruent or angles that are not all congruent
isosceles triangle
a triangle with two equal sides
line of symmetry
A line such that if a shape is folded over this line the two halves of the shape match exactly.
line segment
part of a line with two endpoints
midpoint
a point that divides a segment into two congruent segments
negative numbers
Numbers less than zero on the number line
opposite numbers
Numbers that are the same distance from zero in the opposite direction (-3 and 3)
obtuse angle
an angle that measures more than 90 degrees but less than 180 degrees
positive numbers
numbers greater than zero on the number line
pattern
a change that occurs a predictable way.
parellel lines
lines that never touch
parallelogram
a quadrilateral with two pairs of parallel sides
perpendicular lines
intersecting at or forming right angles
polygon
a shape formed by line segments, called sides, so that each of the segments meet exactly two other segments.
a four-sided polygon
reciprocal
the inverse of a number or fraction.
rational numbers
All positive and negative integers, fractions and decimal numbers.
relationship
an association between two or more variables.
ray
a straight line extending from a point
rectangle
a parallelogram with four right angles
reflection symmetry
a figure has reflection symmetry if it coincides exactly with its reflection image across the axis of symmetry.
regular polygon
a polygon with all sides and all angles equal
rhombus
a quadrilateral with four congruent sides
right angle
an angle that measures 90 degrees
right triangle
Has one right angle and two acute ones.
rotation symmetry
A shape has rotation symmetry if it can be rotated less than a full turn about its center point to a position where it looks exactly as it did before it was rotated.
rule
a summary of a predictable relationship that tells how to find a value of a variable.
sale price
the regular price of an item minus the discount
scale
a labeling scheme used on each of the axis's on a coordinate grid.
scalene triangle
a triangle with no equal sides
side
see polygon
square
having four equal sides and four right angles or forming a right angle
strait angle
an angle with a measure equal to 180 degrees
table
a list of values for two or more variables that shows the relationship between them.
tiling
(also called tessellation) a repeating pattern of plane figures that completely cover a plane with no gaps or overlaps
transversal
a line that intersects two or more lines at different points
trapezoid
A quadrilateral with one pair of parallel sides
variable
a quantity that can change
vertex
point of a polygon
x-axis
the number line that is horizontal on a grid
y-axis
the number line that is vertical on a grid