## 31 terms

### ratio

a comparison of 2 quantities using divison

### rational number

A number that can be written as a/b where a and b are integers, but b is not equal to 0.

### reflection

A transformation that "flips" a figure over a mirror or reflection line.

### reapeating decimal

a decimal that has a pattern that repeats

### rhombus

a parallelogram with four equal sides

### rotation

a transformation in which a figure turns around a point called the center of rotation

### sales tax

an additional amount of money charged on items by governments to raise money

### sample

a part of the population

### scale

a ratio that compares the measurements of a drawing or model to the actual measurements

### scale drawing

a porpotional 3D drawing of an object

### scale factor

scale with out units

### similar figures

figures that have the same shape but not necessarily the same size

### slope

ratio of change of y(the rise) to change in the x(the run) between any 2 points on a line

### stem

digit or digits on the left of a stem-and-leaf plot

### stem-and-leaf plot

type of data display that uses the digits of data values to organize a set

### surface area of a prism

sum of the areas of all the faces of the prism

### terminating decimal

a decimal that ends and does not keep going

### theoretical probablity

the ratio of a number of equaly likely outcomes in an event to the total number of possible outcomes

### transformation

changing a figure into another figure

### translation

transformation in which a figure slides but does not turn. Every point of the figure moves the same direction and the same distance

### trapezoid

a quadrilateral with exactly one pair of parallel sides

### unit rate

a rate with a denominator of 1

### variable

a symbol usually a letter that represents one or more numbers

### variable term

a term that has a variable

### vertex of a solid

a point where the edges of a solid meet

### vertical face

angles opposite of each other when 2 lines intersect. NOT congruent

### volume

the measure of the amount a 3-dimensional figureoccupies

### x-axis

the horizontal number line in a coordinate plane

### x-coordinate

the first number in an ordered pair that tells the distance to move right or left

### y-axis

the vertical axis on a coordinate plane

### y-coordinate

the second number in an ordered pair that tells the distance to move up or down