High Quality Content by WIKIPEDIA articles! In Euclidean geometry, the term rectangle normally refers to a quadrilateral with four right angles. This is a simple rectangle. A rectangle that is not simple is complex, but more clearly described as self-intersecting or crossed. It is defined as a self-intersecting quadrilateral with the same vertex arrangement as a simple rectangle. In recreational mathematics a popular subject is the tiling of rectangles by polygons, ranging from simple puzzles to unsolved problems.
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