Oh, there's a lot! Rhombus, square, rectangle, and parallelogram...
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A parallelogram must have 4 sides and so it must be a quadrilateral. However, the sides of a quadrilateral need not be parallel so a quadrilateral need not be a parallelogram.
A quadrilateral is a polygon with four sides. A parallelogram is a quadrilateral in which the opposite sides are parallel.
No. A quadrilateral is a parallelogram when consecutiveangles are supplementary.
In this case, the quadrilateral is sometimes a parallelogram.
Yes. It's definitely a parallelogram, and also definitely a rhombus. And if one of its angles happens to be 90 degrees, then it's also a square.