A square
a square and a rectangle
a square
I think a square.
A square - or a rectangle.
A shape with opposite sides parallel and of the same length and four right angles is a rectangle.
A rectangle or a square
A square
a square and a rectangle
a square
I think a square.
A square
A square
A square - or a rectangle.
The square and rectangle.
a square or a parallelogram
If you mean shape there is no such shape. if a 4 sided shape has 2 right angles it MUST be either a square or a rectangle, in which case there are actually 4 right angles and 2 pairs of parallel sides. =)