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Quadrilaterals are 4-sided polygons. Sum of angles = 360ยฐ (always!). Types: Square (4 equal sides, 4 right angles), Rectangle (2 pairs equal sides, 4 right angles), Parallelogram (opposite sides equal and parallel), Rhombus (4 equal sides, opposite angles equal), Trapezium (one pair of parallel sides). Area of square = sideยฒ. Area of rectangle = length ร breadth.