Arotation is an isometry that moves a plane across a line of symmetry moves a plane in a straight line motion moves a plane as a mirror image moves a plane about a fixed point

A rotation is an isometry that movesa plane about a fixed point.

Step-by-step explanation:

A linear transformation of a plane that preserves length is known as isometry.A rotation transformation is a rigid transformation or isometery which create the image of a figure ( called as pre-image) with same shape and size by rotating it by some degrees about the fixed center of rotation.

Hence, A rotation is an isometry that moves a plane about a fixed point.