Dimension Radius (Extended Leader)

Used to dimension the radius of a circle or a circular arc with an extended leader.

Tool Setting	Effect
Style	Displays the active dimension style. The drop-down list box allows you to select other available dimension styles.
Magnifying glass icon	Opens the Dimension Styles dialog box, which is used to control settings for dimensioning.
Association	If on, an association point is created. If off, no associations are created.

If Location is set to Manual, enter another data point(s) to form a multi-segment leader line. Reset to complete the dimension.
A radial leader is extended to the center of the circle or arc.
Dimension Radius (Extended Leader)

Key-in: DIMENSION RADIUS EXTENDED