Four different quadrilaterals have their opposite sides parallel: a square, a rectangle, a parallelogram and a rhombus.
To narrow it down further, you would need to know additional information about the quadrilaterals side lengths or angles.
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Yes, it is.
diagonals.
That quadrilateral is known as a 'parallelogram'.
It may be. A quadrilateral has four sides, but they need not be all the same length, nor parallel to each other. It's true that a parallelogram *is* a quadrilateral.
Each side must be parallel to another side.