quadrilateral , a flat shape with four straight sides, rhombus , a flat shape with 4 straight sides that are all equal length , rectangle, a 4 sided shape with straight sides where all interior angles are 90 degrees  , square , a flat shape with 4 straight sides where all sides have equal length and every interior angle is 90 degrees, parallelogram , a flat shape with 4 straight sides where opposite sides are parallel , area , the size of a surface, gram , a metric measure of mass (g) ( 1000 g = 1 kg) , kilogram, a metric measure of mass (kg) ( 1kg= 1000 g) , liter , a metric unit of volume, mostly used to measure liquids .

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