Mathematical Similarity Summary

Figures are mathematically similar if they share a scale factor or if there is a ratio between them.

Any two rectangles are similar?

False, If there is a 1×2 and a 1×3 then

I know this pic is backwards but it says that because there is no scale factor the rectangles are NOT similar.
I know this pic is backwards but it says “because there is no scale factor the rectangles are NOT similar.”