Parallelogram
A parallelogram is a quadrilateral with opposite sides parallel and therefore opposite angles equal.
Parallelogram is an elementary-school-level concept.
It is listed in the California State Standards for Grade 3.
Examples
| Rectangle: |
A rectangle is a quadrilateral with opposite sides of equal length and with four right angles. |
| Square: |
A square is a polygon with four sides of equal length and at right angles to each other. |
Prerequisites
| Angle: |
An angle is a measure of the amount of rotation about the point of intersection of two lines or line segments that is required to bring one into correspondence with the other. |
| Parallel: |
In two-dimensional Euclidean space, two lines that do not intersect are said to be parallel. In three-dimensional Euclidean space, parallel lines not only fail to intersect, but also maintain a constant separation between points closest to each other on the two lines. |
| Polygon: |
A polygon is a two-dimensional figure that consists of a collection of line segments, joined at their ends. |
Classroom Articles on Polygons
Classroom Articles on Geometry (Up to Elementary-School Level)
