If its a triangle then just the one but if it is a square or a rectangle then 4 of them.
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Just the one plus 2 acute angles and so that its 3 interior angles add up to 180 degrees.
one
Just the one and the other two angles must then be acute angles
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.
No right triangle can have any obtuse angles inside it.