Link to definition of similar triangles:
http://www.regentsprep.org/Regents/math/geometry/GP11/Lsimilar.htm
Link to proving triangles are similar:
http://www.regentsprep.org/Regents/math/geometry/GP11/LsimilarProof.htm
Link to mean proportional in a right triangle:
http://www.regentsprep.org/Regents/math/geometry/GP12/LMeanP.htm
The RATIO OF SIMILARITY between any two similar figures is the ratio of any pair of corresponding sides. Simply stated, once it is determined that two figures are similar, all of their pairs of corresponding sides have the same ratio. This can also be called the SCALE FACTOR.
An equation stating that two ratios are equal is called a PROPORTION.
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