Me plzzz. it was predicted that there would be 550 studentsbat sunset park prep. however there were only 500 students. what was the percent error? ?

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.