Examples are: square, rectangle, rhombus and parallelogram
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A quadrilateral doesn't have to have any pairs of parallel lines. It depends what kind of quadrilateral you are talking about... Rectangle- Yes (2 pairs) Square- Yes (2 pairs) Trapezoid- Yes (1 pair) Parallelogram- Yes (2 pairs) Rhombus- Yes (2 pairs)
A quadrilateral is any figure with 4 sides. ("quad" = 4, "latus" = side). It doesn't have to have any parallel lines. If it happens to have two sides that are parallel, then it's a trapezoid. If it happens to have two pairs of parallel sides, then it's a parallelogram. Common parallelograms are rectangles, squares, and kites.
Yes
Since a quadrilateral is a defined as any object with two sets of two parallel lines that form four 90 degree right angles. It would have 2 sets of 2 parallel lines.
Any quadrilateral with two sets of parallel sides is called a parallelogram.