Alberto uses geometry software to draw angle STU and point P, as shown. He marks P as a center and uses the software to rotate triangle STU by 111 degrees around point P. He labels the image of triangle STU as triangle S’T’U’. Which angles must have the same measure as angle SPS’? What is the measure of these angles?

All three equal angles are angle SPS’ = angle ___ = angle ___. These three angles all have a measure of ___