area
the number of square units needed to cover a surface

square units (sq.units)
a unit of area with dimensions 1 unit x 1 unit

formula
a set of symbols that expresses a mathematical rule

tiling
a repeating pattern of closed figures that covers a surface with no gaps and no overlaps

polygon
a plane shape having 3 or more straight side

regular polygon
polygon with all sides and all angles equal

irregular polygon
a polygon with all sides and all angles not equal

parallelogram
a quadrilateral whose opposite sides are parallel and congruent

congruence
having the same size and shape

face
the side of a three dimensional figure

edge
the line made where two or more faces of a solid figure meet

vertex (vertices)
the point where two or more rays meet; the point of intersection of 2 sides of a polygon; the point of intersection of three or more edges of a solid figure; the top point of a cone

angle
a figure formed by two rays that meet at a common endpoint

circumference
the distance around a circle

diameter
a line segment passing through the center of a circle with both ends touching the circumference

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

pi
the relationship of the circle's circumference to its diameter, when used in calculations, pi is typically approximated as 3.14

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