Rectangle
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A rectangle. Since it has two pairs of lines of identical length, then there is no way to have one right angle without all four being right angles (unless you change the lengths and then it is not a parallelogram). If you have four right angles, then you have a rectangle.
All four of the angles of a rectangle (and of squares) are right angles.(Its name comes from this : rect-angle.)
A square and rectangle.
No parallelogram can have only one right angle. The consecutive angles of a parallelogram must be supplementary, meaning they must add up to 180. 180-90=90, so all the angles must be right angles.
quadrilateral -- any such trapezoid- two parallel sides parallelogram : two pairs of parallel sides rectangle - special type of parallelogram with a right angle rhombus: parallelogram with two equal adjacent sides. square: a rectangle with two equal adjacent sides or a rhombus that is a rectangle.