In the diagram, line z is parallel to line y. mangle 1=65 ° , and mangle 7=55 ° . Stuart says that mangle 12=60 ° . His reasoning is shown. Step 1: mangle 8=60 , because mangle 1 mangle 7+mangle 8=180 ° Step 2: angle 8 ≌ angle 12 l, because angle 8 and angle 12 are corresponding angles. Step 3: So, mangle 12=60 Use the drop-down menus to explain whether or not Stuart is correct. Click the arrows to choose an answer from each menu. The sum of angle 1 angle 7 ', and angle 8 is Choose angle 8 and angle 12 are Choose... angles. The measure of angle 12 must be Choose.. . Stuart is Choose_. frac nsquare