Y is a supplementary angle to angle X if X + Y = 180 degrees. The only opposite to X + Y = 180 is X + Y ≠180. Such an angle has no specific name.
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A complementary angle is an angle that when added to another angle creates a 90o angle. A supplementary angle is an angle that when added to another angle creates a 180o angle.
No? Wouldn't they then be supplementary? Opposite rays make a straight angle/line, and if the exterior sides made the straight angle, the adjacent angles would be supplementary. ...Right?
A rhombus is not an angel. One angle of a rhombus can have any value in the range (0, 180) degrees. The opposite angle is the same, and the other two are supplementary.
A supplementary angle can have any value - depending on the first angle.
Supplementary angles add up to 180 degrees