Center Radius Measurement

1. Go to Tools > Measure > Center Radius or press SHIFT+ALT+U. The Center Radius measurement mode is engaged.
2. Click to define the center of the circle.
3. Click on any point along the circumference of the circle. Note that as the cursor is moved away from the center point that the radius is drawn.

Select a markup to reveal its control handles. Each handle controls a different aspect of the markup's size and orientation.

To rotate the markup, click and drag the orange handle outside the markup (when the markup is first placed, it will be at the top). By default, the markup is rotated in increments of 15°; to rotate in increments of 1°, hold down SHIFT while dragging.

The rotation can also be entered in the Rotation field found in the Layout section of the Properties panel.

To rotate the caption, click and drag the orange handle directly over it. By default, the markup is rotated in increments of 15°; to rotate in increments of 1°, hold down SHIFT while dragging.To return a rotated caption to its original position, right-click it and select Reset Caption Position.

To change the length of the radius, click and drag the yellow handle at the circle's center.

To move the entire markup together, click and drag a part of it other than the control handles.

To scale the markup up or down, click and drag the appropriate purple handle.

See Editing Markups for more information.

The appearance of the Radius measurement is configurable, including line and fill color, line width and style, opacity, plus the font style of the caption and whether or not to show it.

To change the appearance of a Radius measurement, select it and click the Properties panel.

Appearance Properties

Color: Sets the line color.

Fill Color: Sets a fill color.

Highlight: Makes the fill color and/or hatch pattern transparent so underlying content shows through.

Opacity: Sets opacity level of the line and endpoints, from 0 (invisible) to 100 (opaque).

Fill Opacity: Sets the fill opacity, from 0 (invisible) to 100 (opaque).

Line Width: Sets the line thickness in points. A setting of 0 effectively renders the line invisible.

Style: Determines the line pattern.

Show Caption: Select to include caption text on the markup. Click Edit to choose which measurements to include.

Font: Sets the font used for the selected text.

Font Size: Sets the size of the font.

Text Color: Sets the color of text.

Font Style: These settings control the formatting of the text. Options include Bold, Italic, Underline, and Strikethrough. Generally, any combination of these styles can be applied to format the text.