SAT Question 4757123b: Area and Volume answer and explanation with Desmos solution

It’s given that trapezoid A and trapezoid B are similar. When two trapezoids are similar, the scale factor between their corresponding side lengths is $k$, and the scale factor between their areas is $k^2$. It’s given that the length of each side of trapezoid A is $41$ times the length of the corresponding side of trapezoid B, so the scale factor between their corresponding side lengths is $41$. It follows that the scale factor between the areas is $41^2$, or $1,681$. Therefore, the area of trapezoid A is $1,681$ times as large as the area of trapezoid B.