<4+<5=180 because they're corresponding angles <4=180-<5 Solving for angle 5. <5+<8=180 because they're supplementary because they're on the same line. <8=<4=180-<5 transitive property of equality
If you're on treca and need help, here is the image. The measure of angle 4 corresponds with angle 1, so it would measure 64.76. To get the measure of angle 6, subtract 64.76 from 180. You get 115.24.
