No because it just means an angle of 90 degrees.
Any polygon can have a right angle. A right angled triangle is an example.
Any polygon, if it is not regular, can have 1 right angle.
A right angle triangle
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Any polygon with 4 or more sides can always have a right angle.
It is a right angle triangle
It can but need not.
A right trapezoid.
either an obtuse, acute, or right angle
right angle triangle
No, no! A RIGHT angle is 90 degrees.
There is only one regular polygon which contains right angles - this is a square. None of the other regular polygons from 3 sides and upwards has a right angle.