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Extrudes aren't the only way to turn sketches into 3D parts. You can also create revolves. First, create a sketch on the front plane and make a corner rectangle 10 mm wide and 20 mm tall, like the one below:
Once you confirm the sketch, click the revolve button.
Unlike extrudes, revolves need two sketch parameters: the faces or sketch regions and the axis to revolve around. For the first parameter, select the rectangle, but for the revolve axis, select only the edge as shown in the image below. Then confirm the revolve and observe.
You should now have a cylinder. Just like extrudes, revolves also have the New, Add, Remove, and Intersect options. Revolves can also become partial by unchecking the checkbox titled Full revolve and entering an angle and direction. Try experimenting yourself. When you're ready, test your understanding by creating a sphere with a diameter of 10 mm. You can also try to create a donut.
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