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Adjacent Angles

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Learning Targets

I can find unknown angle measures by reasoning about complementary or supplementary angles.
I can recognize when adjacent angles are complementary or supplementary.

Notes

If two angle measures add up to 90°, then we say the angles are complementary. Here are three examples of pairs of complementary angles.

If two angle measures add up to 180°, then we say the angles are supplementary. Here are three examples of pairs of supplementary angles.

Complementary and supplementary angles (visual) (practice) | Khan AcademyUse your knowledge about complementary and supplementary angles to find missing angles.

Complementary and supplementary angles (no visual) (practice) | Khan AcademyUse complementary and supplementary angles to solve for a missing angle measure.

Vocabulary

complementary

Complementary angles have measures that add up to 90 degrees.

For example, a 15° angle and a 75° angle are complementary.

supplementary

Supplementary angles have measures that add up to 180°.

For example, a 15° angle and a 165° angle are supplementary.

adjacent angles

Two angles are adjacent when they have a common side and a common vertex (corner point) and don't overlap. In regular English, adjacent means "next to".