A little help please

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In the example below, I'm looking for a way to measure the distance from the centerline of a cylindrical part relative to a datum created from a perpendicular construction (bliue).  The angle was measured from the small cylinder to the perp construction.  I'm just having a brain cramp over the distance.

thanks in advance.

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UPDATE  Boy is my face RED..... I just selected the centerline feature....  DOH

Edited 2 hours ago