A quadrilateral is a two-dimensional polygon that has four (straight) edges and four vertices. The four (interior) angles in a quadrilateral total 360°. Depending on the relationship between the sides and angles, quadrilaterals have a world of their own - here are just a few
square - all four sides are of equal length; all four angles are of equal size (90°)
parallelogram - opposite sides are of equal length; opposite angels are of equal size; adjacent angles sum 180°
trapezium - one pair of parallel sides
These properties of quadrilaterals can be used to solve problems in geometry involving finding missing side lengths, angles and area.
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