Question: Steps Example 1. Start with the triangle sum theorem. mZA+ m/B+mZC = 180 2. Plug in the values you know. + 9 = 180 3.

Steps Example 1. Start with the triangle sum theorem. mZA+ m/B+mZC = 180 2. Plug in the values you know. + 9 = 180 3. Simplify and solve for x. 5x +30 = 180 5x = 150 X = 4. Use that value of x to find mz A. mZA = (2x) = 20 = 5. Repeat step 4 for m_ B. MLB = (3x - 10jp = (3. - 10 )0 = 80 6. Use the triangle sum theorem to mZA+ mZB+mZC = 180 check your answers. 10+ o + 40 = 180 180 = 180
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