The models are second and first respectively.
Step-by-step explanation:
- Step 1: Find the respective models.
For the description, moving 2 of the triangles changes the figure's shape, but not its area, the model is the second one among the three.
For the description, the figure is made up on square with an area of a² and one square with an area of b², the model is the first one among the three.
