1.
A measure of the amount of space inside a two-dimensional shape, given in square_units.
2.
A unit used in measuring area, represented by a square with sides of a specified length.
3.
Units of measurement based on the metric system.
4.
Shapes that have two dimensions - length and width.
5.
A four-sided figure with opposite sides equal and all angles right angles.
6.
A mathematical relationship or rule expressed in symbols.
7.
A four-sided figure with opposite sides equal and parallel.
8.
A four-sided figure with no parallel sides (UK definition) or at least one pair of parallel sides (US definition).
9.
A two-dimensional shape defined by all the points that are equidistant from a fixed point called the center.
10.
A part of a circle enclosed between two radii and an arc.
11.
A mathematical constant (~3.14159) representing the ratio of the circumference of a circle to its diameter.
12.
The distance from the center of a circle to any point on its circumference.
13.
The process of changing from one unit of measurement to another.
14.
A four-sided figure with all sides equal in length, but not necessarily right angles.
15.
A four-sided figure with two pairs of equal-length sides, adjacent to each other.
16.
A rectangle with all sides of equal length.
17.
A three-sided polygon.
