• Feb 8, 2026 lesson7 4applying proportion of similar triangles quiz to apply the proportion of similar triangles to find a missing side? Yes. For example, if triangle ABC is similar to triangle DEF, and AB = 6, AC = 9, and DE = 4, then to find DF, you set up the proportion 6/4 = 9/DF and solve for DF, which equals 6. What are common mistakes to avoid when ap By Cecilia McKenzie