测圆法的

例句：

1. 1. The engineer used a ruler to measure the length of the rope.
   工程师用尺子测量了绳子的长度。
2. 2.We can use a tape measure to measure the width of the room.
   我们可以使用卷尺来测量房间的宽度。
3. 3.To find the radius of the circle, you need to measure the distance from one point to another on the circle.
   要找到圆的半径，你需要测量圆上两点之间的距离。