Meanings
noun
- pluralgeometryplural of complementary angle
Let angle A = 30° and angle B = 10°, so that their complementary angles are A′ = 60° and B′ = 80°, respectively.
nouncomplementary angles pl (plural only)
- pluralplural onlygeometryA pair of angles that sum to a right angle.
A = 30° and A′ = 60°, so A and A′ are complementary angles.
Origin
Complementary in the sense of completing, i.e. they form a complete right angle.
Full word history & related roots →Translations
Arabic زَاوِيَتَانِ مُتَتَامَّتَانِ
- زَاوِيَتَانِ مُتَتَامَّتَانِ (zāwiyatāni mutatāmmatāni)pair of angles
Catalan angles complementaris
- angles complementarispair of angles
Chinese Mandarin 餘角 /余角
- 餘角 /余角 (yújiǎo)pair of angles
Estonian täiendusnurgad
- täiendusnurgadpair of angles
Finnish komplementtikulmat
- komplementtikulmatpair of angles
French angles complémentaires
- angles complémentairespair of angles
Greek συμπληρωματικές γωνίες
- συμπληρωματικές γωνίες (sympliromatikés goníes)pair of angles
Hungarian pótszög
- pótszögpair of angles
Italian angoli complementari
- angoli complementaripair of angles
Japanese 余角
- 余角 (yokaku)pair of angles
Māori koki whakahāngai
- koki whakahāngaipair of angles
Polish kąty dopełniające
- kąty dopełniającepair of angles
Portuguese ângulos complementares
- ângulos complementarespair of angles
Spanish ángulos complementarios
- ángulos complementariospair of angles
Tagalog sihang kapuno
- sihang kapunopair of angles
Cite this entry
APA
complementary angles. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/complementary%20angles
MLA
“complementary angles.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/complementary%20angles. Accessed November 2, 2026.
Chicago
WatkinsX Dictionary, s.v. “complementary angles,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/complementary%20angles.
Source: complementary angles on Wiktionary, CC BY-SA 4.0.