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Proof: Parallel lines divide triangle sides proportionally | Similarity | Geometry | Khan Academy
Prove that a line parallel to one triangle side divides other sides proportionately. View more lessons or practice this subject at https://www.khanacademy.org/math/geometry/hs-geo-similarity/hs-geo-proving-relationships-using-similarity . Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for ...
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