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an obtuse angle
Any polygon can have a right angle. A right angled triangle is an example.
Any polygon can have one right angle, for example, a right angled triangle.
a right angle is exactly a 90 degree angle. for example, there are 4 right angles on a square, the corners are right angles. like the edges on papers that is a right angle. an oblique line is smaller than a right angle.
As an example: a square has four right-angles, one in each corner, and they prove that a right angle doesn't always open to the right.