Three of them providing that they add up to 180 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.
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.
There are no obtuse angles in a right triangle. A right triangle consists of one right angle and two acute angles.
scalene triangle dose not have any equal sides or angles =)