Question

problem 1
only choose 3.
choose 3 scaled copies of rectangle a.

Explanation:

Step1: Find the ratio of sides of rectangle A

The ratio of the long - side to the short - side of rectangle A is $\frac{9}{3}=3$.

Step2: Check the ratios of sides of other rectangles

For rectangle B, the ratio is $\frac{10}{4} = 2.5$.
For rectangle C, the ratio is $\frac{13.5}{4.5}=3$.
For rectangle D, the ratio is $\frac{8}{2}=4$.
For rectangle E, the ratio is $\frac{18}{6}=3$.
For rectangle F, the ratio is $\frac{4.5}{1.5}=3$.

Answer:

C, E, F