A parallelogram is a four sided polygon with opposing parallel sides of equal length. Then if it has four right angles, the polygon becomes a rectangle.
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A parallelogram with four 90 degre angles is called rectangle.
This is a parallelogram called a rectangle. A square has four right angles and four sides that are equal in length.
A parallelogram doesn't need any right angles in order to be a parallelogram.If it has any, then it's a special kind of parallelogram, called a "rectangle".Note:The way the properties of a parallelogram work out,if it has one right angle, then it has four of them.
Square
A parallelogram with 4 equal right angles is a rectangle.