Triangle rst has angles measuring 38 and 75.triangle r's't' has angles meaduring 67 and 38 is this a dilation

No.

A dilation of the kind we are concerned with preserves angle measures. If the angle measures change, it is not a dilation.*


* If the scale factor in one direction is different from the scale factor in another direction, the dilation will not be homogeneous. Angles will not be preserved, though parallel lines will remain parallel. We are generally concerned with homogeneous dilations in which the scale factor is the same in every direction from the center of the dilation.