Similarity + Congruence (8.G.A.2 & 8.G.A.4)
Figures 1, 2, and 3 are SIMILAR because the polygons are the same shape, but not the same size.
Figure 4 is CONGRUENT because the triangles are the same shape, and also the same size.
Figure 4 is CONGRUENT because the triangles are the same shape, and also the same size.