Construction circles

1 Select the Construction Circle tool from the Sketch ribbon group.

2 (Optional) Dimension the center relative to another sketch object.

3 Click to set the circle’s center.

4 (Optional) Dimension the diameter.

5 Click or press Enter to set the circle's diameter.

The circle will snap to existing sketches or determined circles and arcs in the plane of the sketch.

If you sketch two circles that are tangent to each other, and then change the diameter of one circle by editing its dimension, tangency with the other circle is maintained.

Use the Construction Circle tool to draw circles that help you create an accurate sketch. Construction circles cannot be pulled into 3D, and are removed when you select a new sketch plane or exit sketching. The construction circle is useful for dimensioning or indicating a circular relationship of objects that lie on a virtual circular line of centers. For example, bolt hole circles around a flange.

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