Similar
"similar" is referenced in the pages listed below.
Similar triangles  all three corresponding angles the same. AAA
Similar triangles  sides, medians, perimeters, altitudes all in same proportion.
Similar triangles  ratio of areas is the square of the ratio of the sides.
Definition and properties of similar triangles  testing for similarity
Similar triangles  two sides in same proportion, included angle the same. SAS
Definition and properties of similarity
Similar triangles  all three sides in same proportion. SSS
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