can someone please help. This is for a test that I need to turn in in an hour and i don’t know how to do it. there is a picture provided. Plz help

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.