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A right angle is 90 degrees. A regular octagon does not have a single right angle. [example of an octagon: a stop sign]
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A 'regular' octagon has no right angles - each internal angle is 135o

In theory, an irregular octagonal polygon with varying side lengths could have several right angles, I'm not sure if it'd be possible to have more than 4.
Can't see how you could have more than 4...

* * * * *

You can have six. It would be a concave octagon so some of the interior angles are 270 degrees.

It is not possible to draw a diagram here, but if you are comfortable with coordinate geometry, consider the shape formed by joining the following points:

A = (0,0) B = (3,0) C = (3,1) D = (2,1)

E = (2,2) F = (1,3) G = (1,4) H = (0,4)

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Q: How many right angles in an octagon?
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