Does Ratio Of Similar Figures Come Up Often On the SAT Math?

<p>I'm doing Dr. Chung's SAT math, and I'm on tip 2 where he explains ratio of similar figures, and then gives the SAT Practice. I'm having a lot of trouble with the questions, and I was wondering if it is essential for me to understand before moving on. So does anyone know?</p>

<p>I think you should either practice till you understand it well or move on and come back to it later. :)</p>