Rectangle
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A rectangle is a quadrilateral with opposite sides of equal length and with four right angles.
Rectangle is an elementary-school-level concept. It is listed in the California State Standards for kindergarten.
Examples
| Golden Rectangle: | A golden rectangle is a rectangle in which the ratio of the longest to shortest sides is equal to the golden ratio, give approximately by 1.618. Such rectangles appear particularly promnentl in art and architecture. |
| Square: | A square is a polygon with four sides of equal length and at right angles to each other. |