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Complementary angle to which angle?
Vertical angles must be congruent so if they are complementary, they must be 45 degrees to be complementary.
No, complementary angles aren't normally congruent.
a complementary number is a number obtained by subtracting a number from its base. For example the complementary of 7 in numbers to base 10 is 3.
supplementary: 107 degrees complementary: 17 degrees