Therefore, a quadrilateral has two diagonals, joining opposite pairs of vertices.
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In this way he established the harmonic properties of the complete quadrilateral.
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The quadrilateral ADHE therefore has three right angles, so it is a rectangle.
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A square can always also be referred to as a quadrilateral, polygon or shape.
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In Euclidean plane geometry, a rectangle is any quadrilateral with four right angles.
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For an asymmetric quadrilateral this tiling belongs to wallpaper group p2.
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The interior angles of a simple quadrilateral add up to 360 degrees of arc.
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A triangle may be regarded as a quadrilateral with one side of length zero.
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The quadrilateral garden is divided by walkways or flowing water into four smaller parts.
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More examples
A four-sided polygon
In Euclidean plane geometry, a quadrilateral is a polygon with four sides (or 'edges') and four vertices or corners. Sometimes, the term quadrangle is used, by analogy with triangle, and sometimes tetragon for consistency with pentagon (5-sided), hexagon (6-sided) and so on. ...
A polygon that has four sides (cfQuadrilateral Discussion).
Closed, plane figure with four vertices A, B, C and D, connected by four straight sides AB, BC, CD and DA. Properties: If convex, no reflexive angles, both diagonals interior & interior angle sum is 360^0. If concave, one reflexive angle, one diagonal exterior & interior angle sum is 360^0. ...
A four-sided polygon; examples include squares, rectangles, parallelograms, trapezoids, etc.
In GATT parlance, a meeting involving senior trade officials or ministers from the United States, Japan, the European Community, and Canada, convened to discuss trade policy matters and review the status of multilateral negotiations. ...