Vertical angles must be congruent so if they are complementary, they must be 45 degrees to be complementary.
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Complimentary angles
No, complementary angles aren't normally congruent.
not all congruent angles are vertical angles. Vertical angles must share a vertex.
Complementary angles are angles that add up to 90 degrees. So, the complementary angle of 70 degrees would be 20 degrees
The two angles, other than the right angle itself, MUST be complementary.