Ellie was constructing an isosceles right triangle. he is provided with the measure of the base of the triangle. his first step was to use a ruler to draw the base of the triangle, and his next step was to use a protractor to draw one of the base angles. what should his next step be? a.)use a protractor to construct a 45° base angle. b.)use a ruler to draw the first leg of the triangle. c.)use a ruler to draw the second leg of the triangle. d.)use a protractor to draw a right angle.