# Self-Quiz: What's That Isometry?

- Author:
- Brad Ballinger

- Topic:
- Reflection, Rotation, Translation

## Instructions

Below, find a triangle

*before*(blue) and*after*(gold) an isometry moves it. Your job is to decide what kind of isometry it is:**Translation**,**Rotation**,**Reflection**, or**Glide Reflection**. Tips:- For a new isometry, press Shuffle.
- To check your answer, click Reveal Answer.
- You can give the image A'B'C' more or less freedom by adjusting Leash Length--but if ABC is far from the middle, or Leash Length is too great, A'B'C' may be off-screen.

*To make this task harder*, after you have a prediction of the type of isometry, try to also predict (or construct!) additional details, such as vectors of translation, centers and angles of rotation, and lines of reflection.*To make this task easier*, move points A, B, and/or C. Sometimes there's a specific "before" point that helps you more than the default A, B, C; also, if you move a point in small circles and see which direction its image circles, you can narrow down the choices.