It's a rectangle. (And that includes the possibility of a square).
The answer would be the same if you only said "... a parallelogram with a right angle."
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There are no right angles in a parallelogram. A parallelogram only has right angles if it is a rectangle, in which case it has exactly four.
A parallelogram with no right angles and four congruent sides is a Rhombus.
no
A parallelogram with four right angles is a rectangle; if the rectangle also has four equal sides, then it is known as a square.
Not always. A parallelogram only has to have two equal parallel sides and its angles does not have to be 90°. Only two types of parallelogram, the rectangle and the square, have four right angles.