Question

Which best describes a transformation that preserves the size, shape, and angles of an object?

Answer 1

The transformation is ISOMETRY.

In mathematics, an isometry (or congruence, or congruent transformation) is a distance-preserving transformation between metric spaces, usually assumed to be bijective. A composition of two opposite isometries is a direct isometry. A reflection in a line is an opposite isometry, like R 1 or R 2 on the image.