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What can be said about supplementary angles?

They add up to 90 degrees

They add up to 180 degrees

Supplementary angles are defined as two angles whose measures add up to 180 degrees. This fundamental property is crucial in various geometric contexts, such as when working with linear pairs or angles formed by intersecting lines. When two angles are supplementary, you can compute one angle if you know the other, by simply subtracting the known angle's measure from 180 degrees.

The context for the other choices is as follows: angles that add up to 90 degrees are termed complementary, not supplementary. While supplementary angles can be acute, obtuse, or one of each, it is not necessary that both angles are acute or both are obtuse; they could be a combination of both types. For example, a 120-degree angle and a 60-degree angle are supplementary, showcasing that supplementary angles can indeed include angles of different classifications.

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They are both acute

They are both obtuse

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