> ### Measuring an Arc

> Use the Arc option to measure the precise radius, length and angles of any arc on the model. It also calculates the center point location.

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

> The Measurement Entities dialog box appears.

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

> 2. Select Arc Entity if you want to measure a predefined arc.

> All arc and circles are highlighted on the model. Snapping modes are disabled.

> 3. Select From 3 Points if you want to measure the arc between three points. Snapping modes are displayed.

> Select the snapping modes that you want to use for measuring.

> See 3D Snapping Modes

> All entities of the selected entity types are highlighted on the model.

> 4. From the Dist. Units list, select the unit in which you want to measure the arc distance.
> 5. From the Angles Units list, select the unit in which you want to measure the angle.
> 6. If you selected From 3 Points, click three points to define the arc.

> The points are joined by an arc.

> If you selected Arc Entity, click the edge of an arc.

> The arc is highlighted.

> 7. Click to complete the measurement.

> The measured line path, measurement and unit appear in a value box entity on the current active markup layer. The measurements for center point coordinates, radius, diameter, arc length, start and end of angle and sweep appear in the Measurement Entities dialog box.

> 8. To move the value box, click and drag it to anywhere on the markup.
> 9. To resize the value box, select it and then click and drag the frame handles.

> Note: Click Reset to take another measurement.

> 10. Click Close to close the Measurement Entities dialog box.

> See Also Changing Measurement Units and Symbols

> Changing Font

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