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# 7th/8th Math STAAR

### 7th & 8th Math STAAR Vocabulary

TermDefinition
acute angle An angle measuring more than zero degrees and less than 90 degrees
area Surface space that is measured in square units
circumference The distance around a circle (the perimeter of a circle)
complementary angle Two angles whose sum equals 90 degrees
congruent Having the same size and shape
cylinder A solid figure with two congruent and parallel circular bases
diameter A line segment that passes through the center of a circle and has its endpoints on the circle
difference The amount that remains after one number has been subtracted from another
dividend In a division problem, it's the number being divided
divisor In a division problem, the number that an amount is divided by
equation A mathematical sentence that uses an equal sign
equilateral triangle A triangle that has three equal sides and three equal angles
exponent A number that tells how many times the base is multiplied by itself
expression A combination of numbers and variables connected by one or more operations signs
hexagon A polygon with six sides.
isosceles triangle A triangle with two equal sides and two equal angles
lowest terms A fraction with all common factors (other than 1) factored out of the numerator and denominator
mean The sum of a group of numbers divided by the number of numbers; also known as the average
median A value found by ordering a group of data from least to greatest and choosing the middle value of the group.
mode In a group of values, the value that occurs most often
obtuse angle An angle measuring more than 90 degrees and less than 180 degrees
octagon An eight-sided polygon
order of operations Rules that tell which steps to follow when solving an expression
ordered pair Two numbers listed in a specific order; it describes a point on the coordinate graph
parallelogram a quadrilateral with two pairs of congruent, parallel sides
pentagon A polygon with five sides
percent The ratio of a number to 100 (per one hundred); the symbol %
perimeter The distance around a figure
polygon Three or more line segments in a plane that forms a closed figure. The line segments never cross but meet at their endpoints.
prism a solid figure that has two congruent, parallel polygons as its bases. Its sides are parallelograms.
product The result of muliplying two or more numbers
proportion An equation stating that two ratios are equal
pyramid A solid figure that has triangles for its sides and a polygon as its base
quadrant One of the four regions formed by the intersection of the axes of a coordinate graph
quadrilateral A polygon that has four sides
quotient The result of dividing one number by another; the solution to a division problem
radius A length that is half the diameter of a circle; the distance from the center of the circle to the circle itself
range The difference between the least and greatest values in a set of numbers
rate A ratio that compares two different types of quantities
ratio A comparison of the two values of two numbers
reciprocal The inverse of a fraction; when multiplied by the original fraction, it results in a product that equals one
rectangle A parallelogram with four right angles
reflection A mirror image of a figure shown over a line of reflection
rhombus A parallelogram with all sides equal and congruent
right triangle A triangle with one right angle
scale drawing A drawing of an object that is different in size (usually smaller than the original) but keeps the same proportions
scalene triangle A triangle with sides of different lengths and no two angles are the same
similar figures Figures that have the same shape but different sizes; their sides are proportional, while their corresponding angles are equal
simplify To make a fraction easier to work with by taking out common factors
square root A number that when multiplied by itself results in the original number
straight angle An angle that measures 180 degrees
sum The total of two or more numbers being added
supplementary angles Two angles whose sum is 180 degrees
trapezoid A quadrilateral with one pair of parallel sides
unit ratio A ratio that shows the cost per unit of measure
vertex (vertices - plural) The point of intersection for two sides of a plane figure, three sides of a solid figure, or the endpoints of two rays that form an angle.
x-axis The horizontal number line of a coordinate graph
x-coordinate The value on the x-axis used to locate a point on the coordinate graph. It is the first value in an ordered pair.
y-axis The vertical number line of a coordinate graph
y-coordinate The value on the y-axis used to locate a point on the coordinate graph. It is the second value in an ordered pair.
Created by: bmercer