A quadrilateral is the general term for figures with four sides. A kite, rhombus, trapezoid are all examples of quadrilaterals which need not have any right angles. (A rhombus cannot have any)
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All polygons can have right angles except for circle and ovulated shapes. The only 'regular polygon' that has a right angle is the quadrilateral.
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