supplementary
/ˌsʌpləˈmɛntəri/
adjective
- Added to something to improve or complete it; extra.
- The report includes supplementary information about the project.
- The teacher gave us a supplementary worksheet for practice.
- She earns supplementary income from her online store.
- In geometry, describing two angles that add up to 180 degrees.
- If one angle is 110 degrees, its supplementary angle is 70 degrees.
- Supplementary angles together form a straight line.
- The students learned to identify supplementary angles in class.
Synonyms