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# Math Final Review

### Various Math Vocabulary Terms

TermDefinition
proportion a statement that two ratios are equal; cross-multiplication can be used to determine if ratios are proportional.
evaluate to solve an algebraic expression when a value is given for a variable.
perimeter the sum of the sides of a polygon
circumference the measure of the outside of a circle; pi times diameter.
area the measure of the surface of a polygon; a two-dimensional measurement; units squared
acute angle an angle larger than 0 degrees and less than 90 degrees
obtuse angle an angle that is greater than 90 degrees and less than 180 degrees
right angle an angle that measures exactly 90 degrees
pentagon a five-sided polygon
octagon an eight-sided polygon
hexagon a six-sided polygon
decagon a ten-sided polygon
sum of angles in a triangle 180 degrees
sum of angles in a quadrilateral 360 degrees
opposites integers that are the same distance away from zero on a number line, but in opposite directions.
inequality signs less than, greater than, less than or equal to, and greater than or equal to.
radius a line that goes from the center of a circle to a point on the circle; half of the diameter
diameter a line that connects two points of a circle, and passes through the center point; twice the radius
tax and tip usually found by finding the percent of a number, and adding that amount to the original number.
discount usually found by finding the percent of a number, and subtracting that amount from the original number.
surface area the sum of the areas of each face of a polygon.
quadrant one of four regions into which x- and y- axes divide the coordinate plane.
integers the counting numbers, their opposites, and zero.
range the difference between the largest and smallest number in a set of data
median the middle number in a set of data; find the average if there are two middle numbers.
mean the average number in a set of data.
mode the number or numbers that occur the most in a set of data.
Created by: wtr6thscience