Sometimes, the actual arc length is more important to specify then other dimensions. In Drawings and Sketches, you can easily specify the actual arc length.

In a sketch or in a drawing, make sure you in the dimensioning mode. First, select the arc to be dimensioned.

While holding the CTRL key, select the first end point of the arc.

While still holding the CTRL key, select the second endpoint of the arc.

Place the dimension above the arc. The dimension value will be shown with a small arc to denote the value is the arc length.

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