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30 terms

8th grade math vocabulary

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percent
a ratio that compares a number to 100
gratuity
a tip due to how good a waiter was
commission
earning based on the amount of total sales
sales tax
an additional percent on the total price
unit rate
how much for one unit
dilation
a transformation which reduces or increases the size of the original
scale factor
The number of times larger or smaller the image is from the original. 1) If a scale is greater than one the image will be larger. 2) If the scale factor is between 0 and 1 the image will get smaller.
right triangle
90 degree angle
acute angle
an angle less than 90 degrees but more than 0 degrees
obtuse angle
an angle greater than 90 degrees but less than 180 degrees
straight angle
an angle that is 180 degrees
linear pair
two angles that for a straight angle are called a linear pair
supplementary angles
two angles that add up to 180 degrees
complementary angles
two angles that add up to 90 degrees
vertical angles
opposite angles that are always congruent
congruent
equivalent
parallel lines
lines that go on forever and that will never intersect
transversal
a line that intersects two or more lines
corresponding angles
two angles that are in the same place or location on parallel lines cut by a transversal. They are congruent.
~=
sign for congruent
alternate
on the opposite sides of a transversal
interior
in between to two parallel lines
exterior
outside the parallel lines
alternate exterior angles
are congruent
alternate interior angles
are congruent
term
A number or variable or a number with a variable or variables attached by multiplication. For example 3xyz or 5 or n.
monomial
an expression with exactly one term For example 3x or a or b or xy or 7x^3y^7d^3
binomial
an expression with exactly two terms For example 6j^2 +2j^3.
trinomial
an expression with three terms. For example 3x+ 3y+3z.
distributive property
multiply the term in the front of the parenthesis by each term inside the parenthesis