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*Supplementary angles add to 180. The supplement of an angle is the number that must be added to the angle to make it add up to 180. For instance, if an angle is 30, then its supplement is 150. If an angle is 100, its supplement is 80.
**Reflex angles are angles measured the "long way around". A 30 degree angle, if measured on the "outside", is actually a 330 degree angle. The reflex angle for a 100 degree angle is 260.