> ### 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.

> 2. From the Markup Entity toolbar, you can also click Arc .
> 3. Select From 3 Points if you want to measure the arc between three points. The snapping modes are displayed.

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

> To select all snapping modes, click All On. To deselect all snapping modes click All Off.

> See 2D Vector Snapping Modes

> 4. Select Arc Entity if you want to measure a predefined arc.
> 5. From the Arc Info list, select the unit in which you want to measure the distance.
> 6. From the Measure Angle Units list, select the unit in which you want to measure the angle.
> 7. Select Add Radius if you want to measure the radius.

> Select Add Diameter if you want to measure the diameter

> 8. If you selected From 3 Points, click three points to define the arc, then click to complete the measurement

> The points are joined by an arc.

> If you selected Arc Entity, click the edge of the arc that you want to measure. The arc is highlighted.

> 9. 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.

> 10. To move the value box, click and drag it to anywhere on the drawing.
> 11. To resize the value box, select it and then click and drag the frame handles.

> Note: Click Reset to take another measurement.

> 12. Click Close to close the Measurement Entities dialog box.

> See Also Changing Measurement Units and Symbols

> Changing Font

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