All polygons can have right angles except for circle and ovulated shapes. The only 'regular polygon' that has a right angle is the quadrilateral.
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No REGULAR polygon can have three right angles in it. Any polygon with five or more sides CAN have three right angles, as long as it's not regular.
Interior angles of n-sided polygon total (2n - 4) right angles or 180n - 360 degrees.
Interior angles of n-sided polygon total (2n - 4) right angles or 180n - 360 degrees.
a square or a rectangle
A polygon with 4 or more sides can meet these requirements.