> ### Measuring an Arc

> Use the Arc option to define an arc in the drawing and measure its radius, center and diameter.

> 1. From the Markup menu, select Add entity, select Measurement, and then select Arc.

> The Measurement Entities dialog box appears.

> Note: From the Markup Entity toolbar, you can also click Arc .

> 2. From the Arc Info Length list, select the unit in which you want to measure the arc.
> 3. From the Measured Angle Units list, select the unit in which you want to measure the angle. The options are degrees or radians.
> 4. Select Add Radius if you want to measure the radius of the arc.

> Select Add Diameter if you want to measure the diameter of the arc.

> 5. Click three points on the drawing to define the arc you want to measure.

> The points are joined by an arc.

> 6. Click again to complete the measurement.

> The measured line path, arc measurement and unit appear in a value box entity on the current active markup layer and in the Measurement Entities dialog box.

> 7. To resize the value box, select it and then click and drag the frame handles.
> 8. You can click and drag the text box anywhere on the drawing.

> Note: To make another measurement, click Reset.

> 9. Click Close to close the Measurement Entities dialog box.

> See Also Changing Measurement Units and Symbols

> Changing Font

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