An easy example to aquire would be the corner of a sheet of notebook paper or computer paper. 99% of the time, the corners will be perfect right angles.
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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.
if you are doing proof statements...there is converse which is where you flip the statement around so if the statement would be IF a angle measures 90 degrees, THEN the angle is a right anlge. The converse would be IF a angle is a right angle, THEN it is 90 degress. THE COUNTEREXAMPLE would be if the statement was false you would say or show a picture of something defining that statement