Question

the triangles here are each obtained by applying rigid motions to triangle 1. 4. explain how you know.

Explanation:

Rigid motions (translation, rotation, reflection) preserve shape and size. Since all triangles are obtained by rigid motions from triangle 1, they are congruent (same shape and size).

Answer:

All triangles are congruent to triangle 1 as rigid motions (translation, rotation, reflection) preserve side - lengths and angles, so they have the same shape and size.