| 三角形 | san1 jiao3 xing2 | triangle |
| 三角 | san1 jiao3 | trigone |
| 直角三角形 | zhi2 jiao3 san1 jiao3 xing2 | a right angled triangle |
| 等腰三角形 | deng3 yao1 san1 jiao3 xing2 | isosceles triangle |
| 斜边 | xie2 bian1 | sloping side |
| 全等 | quan2 deng3 | congruence (geometry) |
| 等边三角形 | deng3 bian1 san1 jiao3 xing2 | equilateral triangle |
| 底边 | di1 bian1 di3 bian1 | base line |
| 三角板 | san1 jia3 ban3 san1 jiao3 ban3 | set square |
| 基线 | ji1 xian4 | horizontal |
| 不等边三角形 | bu4 deng3 bian1 san1 jiao3 xing2 bu4 deng3 bian1 san1 jiao3 xin | scalene triangle |
| 直角三角 | zhi2 jiao3 san1 jiao3 | a right angled triangle |
| 金三角 | jin1 san1 jiao3 | Golden Triangle (Southeast Asia) |