rectangle
A parallelogram with equal sides is a rhombus. If the interior angles are right angles, it's a square.
It is a rectangle
Generally, there are no right angles in a parallelogram, but rectangles and squares can be seen as special parallelograms, as they have all the qualities needed to be classed as parallelograms, and in addition, they have four right angles.
A rhombus. More information... The no right angles is throwing me, but I will add this comment: A square A four-sided polygon having equal-length sides meeting at right angles. The sum of the angles of a square is 360 degrees. A Parellelogram is a four-sided polygon with two pairs of parallel sides. The sum of the angles of a parallelogram is 360 degrees. A Rhombus is a four-sided polygon having all four sides of equal length. The sum of the angles of a rhombus is 360 degrees. So, a Square is actually a Parellelogram and Rhombus as well; and it has 4 right angles. So... I am not sure that Parellelogram and Rhombus are what you were looking for,
yes, a rectangle is a parallelogram with right angles.
Parellelogram
Yes, the opposite interior angles of a parellelogram are equal.
All the angles in a parallelogram can be equal, but are not always.
Rectangles have four sides and four angles.
square.......
Either 2 or 0
A rhombus does not have four right angles. A square has four right angles, as does a rectangle.