| 1. | the angle is the angle of departure.
为发射角。 |
| 2. | The angle of projection affects the answer .
抛射角对结果有影响。 |
| 3. | The angle of incidence equals the angle of reflection .
入射角等于反射角。 |
| 4. | Let ∠ abc be an angle of ninety degrees .
假设ABC为直角。 |
| 5. | the two lines are united at an angle of 45°.
两线以45度角结合。 |
| 6. | Let angle aob be taken as a central angle of a circle .
设取AOB为一个圆的圆心角。 |
| 7. | An hour later they hit the angle of the highway and the railway .
一个小时后，他们到了铁路和公路交叉的地方。 |
| 8. | At the same time convert the angle of the polygon at that vertex into a straight angle .
同时把该顶点处多角形的角转换成平角。 |
| 9. | The direction of the emergent ray is then known, and the angle of deviation may be found .
这样就得知出射光线的方向，从而可求得偏向角。 |
| 10. | two opposite corners of this rhomb contain three obtuse angles of 101°55'.
菱面体的两个对顶包含着三个10155'的钝角。 |
