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Rules for quadrilaterals:
Any four-sided figure is called a quadrilateral.
is a quadrilateral with four equal sides and four right angles. The area of a square is side² (also called
), or ½
is a quadrilateral with four equal sides and four angles that aren't necessarily right angles. The area of a rhombus is ½
is a quadrilateral with two opposite and equal pairs of sides. All angles in a rectangle are right angles. The area of a rectangle is
A parallelogram is a quadrilateral with two opposite and equal pairs of sides. The area of a parallelogram is
is a quadrilateral with two parallel sides and two nonparallel sides. The area of a trapezoid is ½ (
When making a quadrilateral, the three smallest sides' sum has to be greater than the longest side.
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