# 2.2 Geometric shapes – quadrilaterals

A quadrilateral is a shape with four straight sides.
A square has four equal sides and four right angles. Opposite sides are parallel.
A rectangle has four right angles and opposite sides are equal and parallel.
A parallelogram has opposite sides equal and parallel. Opposite angles are equal.
A rhombus has four equal sides. Opposite sides are parallel and opposite angles are equal.

From the descriptions above, you can see that squares, rectangles and rhombuses are all special types of parallelogram.

OpenLearn - Geometry
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