parallel_perp.gif
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https://go-math-science.com/math/geometry/parallel-and-perpendicular-lines/use-properties-of-parallel-lines-cut-by-a-transversal-to-find-unknown-angle-measures/if-a-transversal-is-perpendicular-to-one-of-the-two-parallel-lines-it-is-also-perpendicular-to-the-other-line/parallel_perp.gif/@@download/image/parallel_perp.gif
parallel_perp.gif
