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View Resource Proportionality in Similar Triangles: A Cross-Cultural Comparison

In the introduction to this site we learn that, "A fundamental result of geometry, used often in secondary and collegiate mathematics, is the equality of ratios of corresponding sides in similar triangles." Accordingly, this concept is expected knowledge of students in physics, engineering, and the sciences, "since its simple statement is rather useful in finding unknown lengths of elementary...

https://www.maa.org/press/periodicals/convergence/proportion...