Answer:
1st and last group represent similar figures.
Explanation:
We have been given a graph. We are asked to find the similar figures.
We can see that triangles in the 1st group are similar triangles as the measure of their corresponding angles are equal.
We can see that rectangle in the last group are also similar as the sides of the yellow rectangle is 2 times the sides of smaller rectangle, therefore, last pair is also similar.
Therefore, 1st and last group represent similar figures.