Length of a rectangle is 4x^2 + 12x and the area of the rectangle is 24x^4 + 72x^3 what is the width of the rectangle

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.