The DXF and DWG file formats also support arcs and circles, which you can approximate in your output formats by creating multiple small line segments approximating the circle or arc.
DXF和DWG文件格式还支持弧和圆，您可以在输出格式中通过创建多个小线段来近似模拟圆或弧。
2
Let's take the Earth going around the sun, and let's approximate the orbit by a circle.
假设地球绕这太阳转，的轨道是个圆圈。
3
A new algorithms for parameters of an image irregular boundary circle parameters is presented, which is based on Curve-Approximate Method.