A dilation that is not merely a translation. Two triangles related by a central dilation are said to be perspective triangles because the lines joining corresponding vertices concur.
Central Dilation
See also
Dilation, Perspective Triangles, Spiral Similarity, TranslationExplore with Wolfram|Alpha
References
Coxeter, H. S. M. and Greitzer, S. L. "Dilation." §4.7 in Geometry Revisited. Washington, DC: Math. Assoc. Amer., pp. 94-95, 1967.Referenced on Wolfram|Alpha
Central DilationCite this as:
Weisstein, Eric W. "Central Dilation." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/CentralDilation.html