| 1. | He outlined the triangle in red. |
| 他用红笔画出三角形。
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| 2. | BC is the base of the triangle ABC. |
| ＢＣ是三角形ＡＢＣ的底边．
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| 3. | a square [ triangle ] shape. |
| 正方［三角］形。
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| 4. | They rotated the globe until the crimson triangle of India was opposite their eyes. |
| 他们转动地球仪直到深红色三角型的印度出现在他们眼前。
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| 5. | A triangle has three sides. |
| 三角形有三条边。
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| 6. | the base of a triangle , pyramid, etc |
| 三角形的底边， 角锥体的底面等
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| 7. | the apex of a triangle |
| 三角形的顶点
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| 8. | fold the napkin into a triangle |
| 把餐巾摺成三角形
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| 9. | the angle contained by two sides of a triangle |
| 三角形两边的夹角
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| 10. | calculate the area of the triangle thus formed |
| 计算这样形成的三角形的面积
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