It is most unlikely. Most polygons will not have any right angles.
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A right trapezium.
Not having studied theology, I am not so sure about angels! A rectangle has four right angles. Also, any polygon with 5 or more sides can have four right angles.
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A four-sided polygon with all sides congruent and with four right angles is a square.
A four-sided polygon with four right angles is a rectangle. If the four sides are congruent, it is a special case of a rectangle called a square.