A Diamond
yes it is a polygon. more specifically it is called a rectangle
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.
An irregular pentagon is a polygon that has five sides and two right angles. A regular polygon on the other hand does not have right angles.
a square...
It's called a rhombus.
a polygon with 5 sides and 2 right angles is a pentagon
Any polygon can have at least one right angled - for example a right angled triangle. An example of an irregular polygon with only right angles is a rectangle.
A polygon with four equal sides and no right angles is called a rhombus. In a rhombus, all sides are of equal length, but the angles are not necessarily 90 degrees; they can be acute or obtuse. This characteristic distinguishes it from a square, which has both equal sides and right angles.
Any polygon with 4 or more sides can have only two right angles.
regular polygon\
A triangle
All polygons can have right angles except for circle and ovulated shapes. The only 'regular polygon' that has a right angle is the quadrilateral.