Two supplementary angles add up to 180 degrees.
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the sum of two acute angles which add up to 180 degree is known as or called as supplementary angle.
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
A 12 degree angle is an acute angle.