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Geometry 18 Online
OpenStudy (anonymous):

If a quadrilateral is a parallelogram then it is a rectangle.?

OpenStudy (anonymous):

Not necessarily. A quadrilateral is anything with 4 sides. A parallelogram is a quadrilateral with 2 pairs of parallel lines. Lastly, a rectangle is a parallelogram with all right angles! |dw:1410910985303:dw|

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