law of constancy of angle

例句：

1. 1.The law of conservation of angle states thatthe sum of the lengths of twostraight lines drawn from the same point isequal to the distance between them.
   角的恒定定律指出，从同一点引出的两条直线的长度之和等于它们之间的距离。
2. 2.In this law, the angles aremeasured in degrees and the sides are measuredin feet.
   在这个定律中，角度是以度为单位测量的，而边长是以英尺为单位测量的。
3. 3. This law has beenused to explain the behavior of many naturalphenomena, such as the movement of planets and the rotation of stars.
   这个定律已经被用来解释许多自然现象的行为，比如行星的运动和恒星的旋转。