Irene cut a quadrilateral from construction paper and measured three of the angles with his protractor. they measured 72 degrees,120 degrees, and 85 degrees. her protractor broke before she could measure the last angle. how can irene determine the measure of the missing angle without using a protractor?

(feel free to explain how you got your answer! : )

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.

whaere is the picture

step-by-step explanation: