Definitely a quadrilateral.
However, if the short sides are equal in length, and the long sides are equal in length then it could be a Kite, Rectangle or Parallelogram, depending upon whether the two short sides are next to, or opposite to, each other, and in the latter case if the angles are all 90° or not.
Also, if two of the sides are parallel but the other two are not, then it could be a trapezium.
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A parallelogram or a rectangle
Without knowing their arrangement or the angles involved, all you can say is that it is a quadrilateral (4 sides). If the long sides are opposite, parallel, and equal in length -- and if the short sides are opposite, parallel, and equal in length -- you have a parallelogram. If all of the angles of the parallelogram are right angles, you have a rectangle.
A quadrilateral. If the short sides are equal in length and the long sides are equal in length then it is a kite. Otherwise it could be a trapezium (eg one with sides 4, 5, 16, 13) or it is an irregular quadrilateral.
a rectangle
A rectangle is a four-sided figure with two long sides and two short sides. The two long sides are the length of the rectangle. The two short sides are the width of the rectangle.