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en.wikipedia.org/wiki/Similarity_(geometry)

Two geometrical objects are called similar if they both have the same shape, or one has the ... Similar triangles. In geometry two triangles, △ABC and ...

www.mathsisfun.com/geometry/triangles-similar.html

Similar Triangles. Two triangles are Similar if the only difference is size (and possibly the need to turn or flip one around). These triangles are all similar: triangles ...

Sal explains what it means for triangles to be similar, and how this follows from the definition of similarity.

Sal solves two problems where a missing side length is found by proving that triangles are similar and using this to find the measure.

Given two similar triangles and some of their side lengths, find a missing side length.

www.mathopenref.com/similartriangles.html

Definition and properties of similar triangles - testing for similarity.

www.varsitytutors.com/hotmath/hotmath_help/topics/similar-triangles

Two triangles are said to be similar if their corresponding angles are congruent and the corresponding sides are in proportion . In other words, similar triangles ...

mathbitsnotebook.com/Geometry/Similarity/SMNumber.html

The use of similar triangles appears in the solutions to many different types of mathematical problems. The good news is that there are often several different ...