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area

the number of square units needed to cover a surface

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square units (sq.units)

a unit of area with dimensions 1 unit x 1 unit

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formula

a set of symbols that expresses a mathematical rule

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tiling

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

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polygon

a plane shape having 3 or more straight side

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regular polygon

polygon with all sides and all angles equal

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irregular polygon

a polygon with all sides and all angles not equal

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parallelogram

a quadrilateral whose opposite sides are parallel and congruent

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congruence

having the same size and shape

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face

the side of a three dimensional figure

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edge

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

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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

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angle

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

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circumference

the distance around a circle

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diameter

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

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radius

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

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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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