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Where does the word "triangle" come from? It comes from Latin triangulum, and was adopted directly into English (1400s).
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Where does the word "triangle" come from? It comes from Latin triangulum, and was adopted directly into English (1400s).
Triangle’s story begins in Latin: triangulum meant “three angles.” Literally three angles, from tri- (three) and angulus (angle). It reached English by 1400s as triangle. Settled as the geometric word for a three-sided shape. Today, triangle means a geometric shape with three sides and three angles.
- Stage 1 · Latin · ancient triangulum "three angles", literally three angles, from tri- (three) and angulus (angle).
- Stage 2 · English · 1400s triangle "a three-sided geometric shape", settled as the geometric word for a three-sided shape.