I NEED HELP ON THIS BADLY PLEASE!!!! IM GIVING LOTS OF POINTS AND BRAINLIEST!!! This is due today so it would help so so much if someone can help me with this please

Supplementary angles add to 180 degrees (because they form a straight line). Since we're given that the angles are congruent, let's call each of them x.
anglePRS + anglePRT = 180
x+x = 180
2x = 180
x = 180/2
x = 90
Each angle marked is a 90 degree angle, aka right angle.