How to build a cad circle?

CAD pruning function, for the straight-line part, I believe many novice have mastered, but for the curve and round part of the many friends there are questions, in the end how to cut the circle of the spare part? The following illustration illustrates the answer to this question. The example in this article is the following figure, which looks like three circles inlaid together:

1, open a new interface, in accordance with other cutting methods, first call the "pruning" tool:

2, the outside of the large circle box selected, and then enter to determine, so that the other parts of the circle can not be modified:

3, select the segment to be deleted:

4, to determine the deletion, so you can verify that the other parts of the circle is not modified, you can see outside the Circle Line segment was cut off, and the part of the circle is still retained:

5, Input TR command, enter, select object Delete:

6. After repeating the previous step, we can trim the beginning of the graph into a ballpark figure:

7, finally, the line will be selected, command e, enter delete:

8, so we will be a beginning of the graphic trim into a complete gossip diagram shape, the effect is as follows: