Which combination of figures are similar and why?

Figure 1 and Figure 3; one figure is larger than the other.

Figure 1 and Figure 2; the side lengths are proportional and corresponding angles are equal.

Figure 1, Figure 2, and Figure 3; all figures are rectangles.

Figure 2 and Figure 3; the figures are both vertical.

The correct combination of figures that are similar is Figure 1 and Figure 2. This is because the side lengths are proportional and corresponding angles are equal. In similarity, the shape of the figures remains the same, but the sizes may differ. In this case, Figure 2 is a smaller version of Figure 1, making them similar.

so what's the answer?

The correct combination of figures that are similar is Figure 1 and Figure 2.