Similarity in fluid mechanics

[welovephysics]

Homework Statement

i know that the ratio of length of prototype divided by the length of model would yield Lr

But , some book gave that length of model divided by length of prototype also= Lr ?

Homework Equations

The Attempt at a Solution

Which is correct ?

 

[welovephysics]

IMO , both also correct ? am i correct ? can someone clarify?

 

[welovephysics]

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