area

• (geometry) the amount of space within a closed shape; the number of square units needed to cover a figure

base

• (geometry) the flat side on which a polygon sits; the flat face on which a 3-dimensional shape can rest

circumference

• the distance around a circle

diameter

• a straight line through the center of a circle; a line drawn from one side of a circle to the other that passes through the center

height

• how tall something is; the distance from the bottom to the top of something

length

• how long something is; the distance from one end to the other

parallelogram

• a shape or with four straight sides, four corners, and both sets of opposite sides parallel and the same length

perimeter

• the distance around the outside of an object or shape

perpendicular

• meeting at a right angle; at 90 degrees to something

pi

• (math) a constant with the approximate value of 3.14, written with the symbol ∏; a value that for any circle equals the circumference divided by the diameter

radius

• the distance from the center of a circle to any point on the outside edge

width

• the distance across something; the measurement of something from one side or edge to another