Daniela began a plan for this proof. Since 1 and 2 are supplementary and 2 and 3 are supplementary, then m1+m2=180 and m2+m3=180. If she can get m1 and m3 to both equal the same expression, she can use the transitive property of equality to set them equal to each other. How can Daniela get m1 and m3 to both equal the same expression? Given: 1 and 2 are supplementary. 2 and 3 are supplementary. Prove: 13 Angle 1 is less than 90 degrees, angle 2 is greater than 90 degrees, and angle 3 is less than 90 degrees. CLEAR CHECK She can subtract m2 from both sides of m1+m2=180 and m2+m3=180 . She can subtract m1 from both sides of m1+m2=180 , and subtract m3 from both sides of m2+m3=180 . She can subtract 180 from both sides of m1+m2=180 and m2+m3=180 . She can measure m1 and m3 with a protractor