altitude

The perpendicular distance from the base of a geometric figure to the opposite vertex.

area

The number of square units needed to cover a given surface.

base

The number being put to a power: 8^3=8x8x8, 8 is the base.

circle

A closed curve with all points on the curve an equal distance from a given point called the center of the circle.

circumference

The distance around a circle: equal to pi times diameter.

parallelogram

A quadrilateral whose opposite sides are parallel and congruent.

pi

The ratio of the circumference of a circle to the length of its diameter: pi=3.14 or 22/7.

quadrilateral

A four-sided polygon (shape).

radius

A line segment with one endpoint at the center of a circle and the other endpoint on the circle.

rhombus

A parallelogram whose four sides are congruent and whose opposite angles are congruent.

square unit

A unit of measure that has a length of one unit and a width of one unit used to measure area.

trapezoid

A quadrilateral with only one pair of parallel sides, normally connected by slanted sides.

vertex

The point where two sides meet.