On this measurement word problem

Acaterpillar started at point (−2.5, −5.5) on a coordinate plane. she crawled in a straight line through the origin to point (45, y). what is y?

Multiplying an even number of negative numbers gives an answer that is choose from:

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.