∠A = 70, ∠B =10, ∠A+∠ B = 180, saying "∠ A and ∠ B are complementary".
∠C = 130, ∠D = 50, ∠ C+∠ D = 180, saying "∠C and ∠D are complementary".
The following methods are often used to prove the complementarity of the two angles:
According to the definition of complementary angle or adjacent complementary angle
According to the parallelism of two straight lines, the inner angles on the same side are complementary.
According to the diagonal complementation of quadrilateral inscribed in a circle
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