The general Dimension command (which should still be active) is also used to place radial dimensions. Move your cursor over the right-most arc in the front view. Click when the arc geometry highlights.
Drag your cursor to place the radial dimension.
Move your cursor over the left-most arc in the front view. Move your cursor along the arc until the green-filled circle appears at the 270-degree position. It indicates that you located the left-most quadrant key point. Click to select the left-most point of what will be an overall reference dimension.
CAUTION: The midpoint of the arc segment also displays a green-filled circle at approximately 290 degrees. Selecting the arc segment midpoint will not produce the appropriate dimension.
Move your cursor over the right-most arc in the front view. Move your cursor along the arc until the green-filled circle appears to indicate that you located the right-most quadrant key point. Click to select the right-most point of what will be an overall reference dimension.
Drag your cursor to place the overall dimension.
TipDimensions, centerlines, and center marks can also be placed for holes and other features in isometric views.