A - 20° = 90° - A
∴ 2A = 110°
∴ A = 55°
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72
Suppose the angle is x degrees. It is 26 deg more than its complement so the complement is x - 26 degrees. Since the two angles are complementary, their sum is 90 degrees. That is x + x - 26 = 90 or 2x - 26 = 90 so that 2x = 116 and so x = 58 degrees.
74
180-20=160
An angle of more than 90 degrees is called an "obtuse" angle. Strictly speaking an obtuse angle is from 90 to 180 degrees.