Just the one.
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If its a triangle then just the one but if it is a square or a rectangle then 4 of them.
one
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.
Just the one and the other two angles must then be acute angles
There is no such shape since an angle can always be added to any shape.