Project circle to plane (at angle 45°)

Project circle to plane (at angle 45°)

Hi, Wondering what could be the best way to project this circle (which is at 45° from the end plane) to the respective end plane ? Any suggestions:)
I intend to find out distance between the centring hole on the end plane & this 45° cylinder projection's centre point on that same plan. 

Appreciate your answers,
Regards