Two figures are homothetic if they are related by a dilation (a dilation is also known as a homothecy).
This means that the connectors of corresponding points are concurrent
at a point which divides each connector in the same ratio 
, known as the similitude ratio.
Similitude Ratio
See also
Complement, Concurrent, Dilation, Homothecy, Homothetic, Homothetic CenterExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Similitude Ratio." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SimilitudeRatio.html