Quadrilateral facts for kids
Quick facts for kids Quadrilateral |
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Some types of quadrilaterals
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| Edges and vertices | 4 |
| Schläfli symbol | {4} (for square) |
| Area | various methods; see below |
| Internal angle (degrees) | 90° (for square and rectangle) |
In Euclidean plane geometry, a quadrilateral is a polygon with four edges (or sides) 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.
The word "quadrilateral" is derived from the Latin words quadri, a variant of four, and latus, meaning "side".
Quadrilaterals are simple (not self-intersecting) or complex (self-intersecting), also called crossed. Simple quadrilaterals are either convex or concave.
All non-self-crossing quadrilaterals tile the plane by repeated rotation around the midpoints of their edges.
Images for kids
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An antiparallelogram
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The (red) side edges of tetragonal disphenoid represent a regular zig-zag skew quadrilateral
See also
In Spanish: Cuadrilátero para niños
