Practical Autodesk AutoCAD 2021 and AutoCAD LT 2021
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Tan, Tan, Radius and Tan, Tan, Tan

The next example will require you to specify two geometries on which the circle will be tangent and then the radius of the circle:

  1. Select the Tan, Tan, Radius circle option from the flyout.
  2. Click anywhere on the AB line and then click anywhere on the AC line. Now, the command line will prompt you to select the radius of the circle, as in the following screenshot.
  3. Type 2 and press Enter and you will have your circle that is at a tangent to the AB and AC lines. The radius of the circle will be 2 units, as demonstrated in the following diagram:

Figure 2.30: A circle tangent to two lines

In the last circle option, Tan, Tan, Tan, you need to only specify three geometries on which the circle will be tangent:

  1. Select the Tan, Tan, Tan circle tool from the Circle flyout.
  2. Click on the AB line, then click on the BC line, and finally, click on the AC line.
  1. You will get a circle that is tangent to all three lines and it will look like this:

Figure 2.31: A circle tangent to three lines

So, in this way, you can make circles using different methods and the selection of the method depends on the dimensions provided and the type of geometry you are required to make. In the next section, we will explore the arc tool, which is basically a part of the circle, but the workflow of making an arc is very different from that of a circle.