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A square or rectangle are the only regular polygons, but many other shapes have two right angles and two parallel lines.
Depends on the shape. A right triangle has one right angle, a rectangle has 4, an equilateral triangle has none, a circle has no angles. There are polygons with more than 4 right angles, and there is no limit on how many, but those with more than 4 are not convex.
The sum of the interior angles of any n-sided figure is (2n - 4) right angles or (180n - 360) degrees
There can be 0 to 5 right angles, or 1 to 6 obtuse angles in a hexagon.
4 right angles, no other angles.