###
face

the flat surface of a three-dimensional figure

###
edge

the line segment where two faces of a three-dimensional figure meet

###
length

the measure of a line segment, or one side or edge of a figure

###
volume

the measure of the amount of space occupied by an object

###
cubic unit

a unit for measuring volume such as a cubic inch or cubic centimeter. It is the volume of a cube with 1-unit edges

###
rectangular prism

a prism with congruent rectangular bases

###
area

the amount of surface covered or enclosed by a figure measured in square units

###
one-dimensional

having only length as a measure. A line segment is this.

###
two-dimensional

having length measurements in two directions, perpendicular to each other (length, width)

###
three-dimensional

having length measurements in three directions, perpendicular to one another (length, width, height)

###
capacity

a measure of how much a container can hold, also used to describe the volume of fluids such as water or sand

###
liter

the basic unit of capacity in the metric system

###
milliliter

a metric unit of capacity equal to 0.001 liter

###
kiloliter

a unit of capacity equal to 1,000 liters

###
mass

the amount of matter in an object. It is constant; weight varies because it is subject to the effect of gravity on matter.

###
kilogram

a unit of mass equal to 1,000 grams

###
gram

the basic unit of mass in the metric system. A nickel weighs about 5 of these.

###
milligram

a metric unit of mass equal to 0.001 gram.

###
ounce

a unit of weight or capacity in the U.S. customary system equal to 1/16 of a pound or 1/8 of a cup

###
pound

a U.S. customary unit for measuring mass. One is equal to sixteen ounces.

###
ton

a customary unit for measuring mass. One is equal to 2,000 pounds.

###
gallon

a U.S. customary unit for measuring capacity. One of these is equal to 4 quarts.

###
quart

a U.S. customary unit for measuring capacity. One is equal to 32 ounces, 4 cups, 2 pints.

###
pint

a U.S. customary unit for measuring capacity. One is equal to two cups or half a quart.

###
cup

a customary unit for measuring capacity. There are 2 of these in a pint.

### Please allow access to your computer’s microphone to use Voice Recording.

## We can’t access your microphone!

### Click the icon above to update your browser permissions above and try again

Example:

### Reload the page to try again!

Reload

## Press Cmd-0 to reset your zoom

## Press Ctrl-0 to reset your zoom

### It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

## Your microphone is muted

### For help fixing this issue, see this FAQ.