+A **quadrilateral** is a [Polygon](/wiki/Polygon) defined by four [Edges](/wiki/Edge) and four vertices. Its internal angles sum to 360 degrees, forming a fundamental shape in [Geometry](/wiki/Geometry).
+## See also
+- [Square](/wiki/Square)
+- [Rectangle](/wiki/Rectangle)
+- [Rhombus](/wiki/Rhombus)
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