joey has a square piece of paper with edges that are 8 inches long. he cuts the paper along a diagonal to make two congruent triangles. which measurement is closest to the length, in inches of the hypotenuse of each triangle

"image"

step-by-step explanation:

in most of these problems, the notation is that the point with a "prime" is the image of the point without. that is, b' is the image of b.

here, there is no dilation or reflection. there is simply translation (with no direction shown). which figure you call the "preimage" and which one you call the "image" is up to you. as a matter of convention, the naming is as described above.