Scaling - maybe I don't understand math

Hello,

I wanted to get a better understanding of the Rhino Scale Command.

If I have a square at 6.5 all sides and another square at 3.25 all sides then click both to scale proportionately and scale the 6.5 by an increase of 1 to 7.5… the small square becomes 4.75. Shouldn’t the small square be 4.25 to maintain the relationship to the starting dimensions and not necessarily each other?

Thank you,
RP

Hi RP - I get 3.75 on the smaller square, as I’d expect… The scale factor for 6.5 > 7.5 is 1.154.

-Pascal

Scale factors work by multiplication, not addition. When two different size objects are scaled by the same factor the ratio of the size of the objects remains the same (size A / size B), not the difference (size A - size B).

Ah yes. Factors of multiplication.

It’s a funny problem to think of scaling as addition.

Thank you both!