Quadrilaterals
How many different quadrilaterals can you draw on this 9-pin geoboard?
A quadrilateral is a polygon with 4 sides. Some quadrilaterals have special names. A regular polygon is called a square . A quadrilateral is called a rectangle if: Opposite sides are equal length Opposite sides are parallel All angles are right angles A quadrilateral is called a parallelogram if: Opposite sides are parallel Opposite sides are equal length Opposite angles are equal
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