OLCreate: Shape, space and measures: Quadrilateral

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Quadrilaterals are 2-dimensional (flat) polygons with 4 sides, and 4 angles totalling 360° (360 degrees). Here are some examples.

A square has four sides of equal length, and four 90° (right) angles.

A rectangle has four 90° (right) angles, and the sides opposite each other are of equal length.

The opposite sides of a parallelogram are parallel and equal in length, and opposite angles are equal.

Parallel lines run the same distance apart for their entire length, as in the opposite sides of a square, rectangle or parallelogram.

Perpendicular lines join at right angles (90°) as in the those forming the corners of a square or rectangle.

A trapezium has two sides which run parallel to each other, and two which do not, and two sets of equal angles.

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