how can you mate two bodies a cylider which is cut at an angle to a flat body the flat body to mate ontop of the cylinder at the said slanting angle

WO 2016-06-15

hi i would like to mate the square solid body to the cut cylindrical tube thats already mated to some parts as shown in the attachment. i want the body mate with the cylindrical tube at the top at that angle.

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Solidworks Assemblies