Quadrilateral

Definition

A four-sided polygon.

Used by AQA, Edexcel and OCR

Specification G4 · Paper 1, Paper 2, Paper 3

A four-sided polygon is a quadrilateral.
Revise: Quadrilaterals and Polygons

Specification G4 · Paper 1, Paper 2, Paper 3

A triangle has three straight sides; a quadrilateral has four. Rather than deciding a shape’s name by how it is turned or how it looks, examine its sides, angles and symmetry. On a diagram, matching ticks mark equal lengths, matching arrows mark parallel sides, and a small square marks a right angle.

1
Do not use the converse of a property without knowing that it is a valid test. For example, one pair of equal opposite sides alone does not prove that a quadrilateral is a parallelogram.

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Specification 8.01c, 8.04b · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)

A triangle has three sides and a quadrilateral has four. A shape with a curved edge, or a gap in its boundary, is not a polygon.
Revise: Polygon Classification
A closed, flat polygon with four straight sides and four vertices.
Revise: Quadrilateral Properties