90-71 = 19 degrees
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A supplementary angle is a 180-degree angle minus the number of degrees in the given angle.
89.999... degrees. An acute angle is any degree under 90.
Suppose the angle is x degrees. Its complement is 90-x So x is 2/3 of (90-x) 3x = 2*(90-x) = 180 - 2x 5x = 180 so that x = 36 degrees
As many as you like because any triangle that has a 90 degree angle is always a right angle triangle.