You can measure and display the length of an arc using an arc length dimension. You can set the arc length symbol position in Dimension Style Manager. Once you select an arc, drag the cursor to display its dimension. To access the arc length option:Click Dimension menu > Arc LengthCommand prompt: DIMARC Arc Length dimensions are indicated by:An arc length symbol above or preceding the dimension text Dimension lines from the start to the endpoint of the arcExtension lines that display the start and endpoint of the arc