intercept theorem
theorem on ratios of line segments formed when 2 intersecting lines are cut by a pair of parallels
en-GB/ˌɪntəˈsɛpt ˈθɪəɹəm/
en-US/ˌɪntɚˈsɛpt ˈθɪɹəm/
theorem on ratios of line segments formed when 2 intersecting lines are cut by a pair of parallels