Meaning & use
supplementary angles
Two angles whose measures add up to exactly 180 degrees.
See it in a sentence
Since the two angles form a straight line, they are supplementary angles.
A 110-degree angle and a 70-degree angle are supplementary because their sum is 180 degrees.
A note on using this word
Do not confuse with complementary angles, which add up to 90 degrees instead of 180.
Words with a similar meaning
This term is best learned through its definition and examples.
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Words with an opposite meaning
complementary angles
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