Lisa has 6 cds that she is going to give away. She lets her best friend choose 3 of the 6 cds. How many different groups of 3 cds are possible

the correct answer would be c

it is rigid.; it is isometric. ; the size is preserved.

step-by-step explanation:

a translation is called an isometry; these are transformations that preserve congruence between pre-images and images.

they are also called rigid transformations, as the only thing that can happen to a pre-image is that it is moved or turned, not stretched or shrunk.

since congruence is preserved, the size is preserved.