三角 sānjiǎo triangle
How to remember 三角: 三 three + 角 horn = triangle.
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How it is used
- 'Triangle' and 'triangular' - 三角形 (sānjiǎoxíng) a triangle, 三角关系 (sānjiǎo guānxi) a love triangle.
- Also the root for trigonometry - 三角函数 (sānjiǎo hánshù) trig functions.