In geometry, a quadrilateral is a four-sided polygon, having four edges (sides) and four corners (vertices). The word is derived from the Latin words quadri, a variant of four, and latus, meaning "side". It is also called a tetragon, derived from Greek "tetra" meaning "four" and "gon" meaning "corner" or "angle", in analogy to other polygons (e.g. pentagon). Since "gon" means "angle", it is analogously called a quadrangle, or 4-angle. A quadrilateral with vertices A, B, C and D is sometimes denoted as \square ABCD.
A quadrilateral is a four-sided polygon with four edges and four corners (vertices). It matters because it is a fundamental shape in geometry, with the term derived from Latin and Greek words meaning "four sides" and "four angles," making it a basic building block for understanding more complex geometric forms.
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via Wikipedia infobox
{{Infobox Polygon | name = Quadrilateral | image = Six Quadrilaterals.svg | caption = Some types of quadrilaterals | edges = 4 | schläfli = {4} (for square) | area = various methods;see below | angle = 90° (for square and rectangle)}} In geometry, a quadrilateral is a four-sided polygon, having four edges (sides) and four corners (vertices). The word is derived from the Latin words quadri, a variant of four, and latus, meaning "side". It is also called a tetragon, derived from Greek "tetra" meaning "four" and "gon" meaning "corner" or "angle", in analogy to other polygons (e.g. pentagon). Since "gon" means "angle", it is analogously called a quadrangle, or 4-angle. A quadrilateral with vertices A, B, C and D is sometimes denoted as \square ABCD.
Quadrilaterals are either simple (not self-intersecting), or complex (self-intersecting, or crossed). Simple quadrilaterals are either convex or concave.
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