Posted on May 18, 2025 by Quiz of the Day #1. An improper rotation consists of: A rotation followed by a reflection in a plane containing the rotation axis. A rotation followed by a reflection in a plane perpendicular to the rotation axis. A reflection followed by a rotation in a plane parallel to the reflection plane. An inversion followed by a rotation. See this article for more details. Previous Check Answer Results Click the “Quiz” button for a new question