tessellation

An arrangement of closed figures that completely covers a surface with no gaps and no overlaps

Example:

transformation
The movement of a figure by a translation, reflection, or rotation

Examples:

translation reflection   rotation

translation (slide)

A movement of a figure along a straight line

Example:

trapezoid

A quadrilateral with one pair of parallel sides

Examples:

triangle

A polygon with three sides

Examples:

two-dimensional

Measured in two directions, such as length and width

Example:

	width
length