A rhombus
square
The figure you are describing is a rhombus. A rhombus has two sets of parallel sides, all sides of equal length, and features two acute angles and two obtuse angles. The properties of angles in a rhombus ensure that opposite angles are equal, with the sum of adjacent angles being 180 degrees.
A square, rectangle, or quadrilateral
rhombus (although the angles can technically be right angles as well)
triangle
A four-sided figure with two pairs of parallel sides the same length and four right angles is called a square.
Square
square
A quadrilateral with 4 right angles and opposite sides that are parallel can be either a rectangle if the adjacent sides are of different length or a square if the adjacent sides are of the same length.
A square, rectangle, or quadrilateral
rhombus (although the angles can technically be right angles as well)
triangle
A rhombus. A square is one special rhombus with right angles.
irregular trapezoid
You are a rhombus.
triangle
This figure is infact a square, because a square it the only regular quadrilateral.