A triangle can only have a maximum of 1 right angle. The total degrees of all the angles of a triangle adds up to exactly 180. Since a triangle must have exactly three angles, it is not possible for the triangle to have more than one angle that is 90 degrees.
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Just the one.
If its a triangle then just the one but if it is a square or a rectangle then 4 of them.
one
A right angle triangle can only have one right angle of 90 degrees
There is no such shape since an angle can always be added to any shape.