A quadrilateral. (which may have a pair of parallel sides, or two pair, as follows:)
If opposite sides are parallel and equal in length, but angles are not right angles, it is a rhombus.
If opposite sides are parallel, all angles are right angles, but there are two sides longer than the other two, it is a rectangle.
If all four sides are the same length, and all angles are 90°, it is a square.
It is also a Trapezium e.g Rectangle.
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A shape with 4 sides and two parallel lines is a trapezoids. Trapezoid, like other quadrilaterals, have four sides but unlike squares, rhombuses, or rectangles, only have one set of parallel lines, or two that are parallel. Trapezoids can be isosceles or equilateral.
There are two shapes with 4 sides and 2 right angles. Rectangle and Rhombus fall under this category.
Shapes that have four straight sides are quadrilaterals. Squares, rectangles, and trapezoids are shapes that have four sides. A rhombus also has four sides.
This is a parallelogram, opposite sides are of equal length and opposite angles are equal in size.