Question

1. a(n) ____________ is a transformation where distance and angle measures are preserved. (the pre - image and image stay congruent.)

isolation
dilation
rigid motion
movement

Explanation:

Rigid motion in geometry preserves distance and angle - measures, keeping pre - image and image congruent. Isolation is not a geometric transformation term in this context. Dilation changes size and thus does not preserve congruence. Movement is a general term, while rigid motion is the specific geometric concept here.

Answer:

rigid motion