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Complimentary angles
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Yes, the opposite rays of vertical angles are always coplanar, so the angles are as well.
Complimentary angles ARE NOT always congruent. However, if one angle is 45 degrees, then they would be congruent since the other would have to be 45 degrees to add up to 90 degrees.
Complimentary angles are a pair of angles where the sum of their degrees equal 90.