Given an angle A whose measure is in the range [0, 180] degrees, the supplementary angle to A is the angle B such that the measure of A + B = 180 degrees.
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It is: "angle a is not a right angle" or "angle a is greater than or less than a right angle".
angle B and angle D are supplements, angle B is congruent to angle D, angle A is congruent to angle A, or angle A is congruent to angle C
An angle of 98 degrees is an obtuse angle
reflex angle
A 12 degree angle is an acute angle.