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When using the Haochen CAD drawing software to create drawings, if there are unclosed shapes, certain operations cannot be performed; for example, when filling a area, it is required that the area in question be closed. So how can a shape be closed? Next, let’s take a look together at the CAD tutorials related to closed shapes in the domestic CAD software, HaoChen CAD! The steps to close a shape in CAD drawing software are as follows: 1. First, open the HaoChen CAD drawing software, then enter the shortcut command: PL, and press Enter to confirm; for example, this will draw a multi-segment line. 2. Next, enter the shortcut command: PE, and press Enter to confirm. Enter M as prompted in the command line, press Enter to confirm, and select the newly drawn polyline. 3. Enter C as prompted by the command line, press Enter to confirm, and the shape will be closed. As shown in the figure below: the screenshot above makes it clear at a glance the difference between closed and unclosed states. Precautions when using the PE command: If the shape is already closed, use the PE command to convert the lines into polylines, and then there is an option for merging ； If there are gaps in the shape, use the F (Chamfer) command; remember to set the radius R to 0, and then apply the chamfer. Additionally, besides the PE command, a boundary method can also be used; the shortcut key is BO. Select the area, and again, what these lines enclose forms a closed shape. The above are the tips for using the closing command in the domestic CAD software Haocheng CAD. In future drawing tasks where it is necessary to close a shape, you can refer to this CAD tutorial to solve such issues~