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[edit]. 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 ...

www.mathopenref.com/similartriangles.html

Definition and properties of similar triangles - testing for similarity.

www.khanacademy.org/math/geometry/hs-geo-similarity/hs-geo-triangle-similarity-intro/v/similar-triangle-basics

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

www.khanacademy.org/math/geometry/hs-geo-similarity/hs-geo-solving-similar-triangles/v/similarity-example-problems

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

www.khanacademy.org/math/geometry/hs-geo-similarity/hs-geo-solving-similar-triangles/e/solving_similar_triangles_1

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

www.math.com/school/subject1/lessons/S1U2L4DP.html

When two figures are similar, the ratios of the lengths of their corresponding sides are equal. To determine if the triangles shown are similar, compare their ...

www.mathsteacher.com.au/year9/ch13_geometry/08_similar/similar.htm

Similar triangle, equiangular, corresponding sides, same ratio, solving problems involving similar triangles.

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 ...