90 degrees. 1/2 pi radians.
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At most two: 45 degrees(deg) and 45 deg. Of course, there may be no equal angles, e.g. 30, 60 and 90 deg. As long as the angles add up to 180 deg and one is one right angle (90 deg) while the other two add up to 90 deg, the triangle is a right triangle.
That can also be called a flip or a U-turn or a 180.
180 deg - 165 deg 12 min
the supplementary angle of 22 deg = 180-22 = 158 deg.
The triangle will then have 3 angles of 45, 45 and 90 degrees and take the shape of an isosceles right angle triangle.