###
chord

a straight line connecting two points on a curve

###
circumference

the distance around the outside of a circle

###
composite number

a whole number greater than 1 that has more than two factors

###
diameter

the distance across a circle through its center

###
expanded notation

A way to write numbers that shows the value of each digit

###
greatest common factor

The largest factor that two or more numbers have in common.

###
heptagon

a seven-sided polygon

###
histogram

a bar graph that shows the frequency of data within equal intervals

###
hypotenuse

the longest side of a right triangle

###
least common denominator

The least common multiple of the denominators of two or more fractions.

###
least common multiple

the smallest multiple that is exactly divisible by every member of a set of numbers

###
nonagon

a nine-sided polygon

###
plane

A flat surface that goes on forever in all directions

###
prime number

A whole number that has exactly two factors, 1 and itself.

###
quadrants

four regions into which a coordinate plane is divided by the x-axis and the y-axis

###
radius

the length of a line segment between the center and circumference of a circle or sphere

###
rate

the relative speed of progress or change

###
ratio

the relative magnitudes of two quantities (usually expressed as a quotient)

###
regular polygon

a polygon with all sides and all angles equal

###
repeating decimal

a decimal with a sequence of digits that repeats itself indefinitely

###
similar polygons

polygons that are the same shape but different sizes

###
straight angle

an angle of 180 degrees

###
terminating decimal

a decimal whose digits end

###
unit price

The price of a single item or amount (e.g., $3.50 per pound).

###
whole number

a number without fractions; an integer.

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