# Open Middle Problems

- Author:
- Tim Brzezinski

This book serves as a collection of Open Middle-themed problems. Several of the problems here are exact digital analogues of those found on Open Middle's site, https://www.openmiddle.com/. For these problems, credit and inspiration is attributed to the problem creator(s). Other problems here are characteristic of the Open Middle theme. This volume will continue to grow over time.

## Table of Contents

### Surface Area & Volume

### Transformational Geometry

### Algebra + Coordinate Geometry

- Creating Distances on a Grid: Conceptual Formative Assessment
- Creating Distances in the Coordinate Plane: Formative Assessment with Feedback
- Building Parallelograms in the Coordinate Plane (Version 1)
- Building Parallelograms in the Coordinate Plane (Version 2)
- Creating Squares
- Create a Rectangle with Given Area Whose Vertices Have No Repeated Coordinates
- Perpendicular Lines and Slope
- Creating Right Triangles!
- Perpendicular Lines Through a Given Point
- How Close to Perpendicular Can You Get? Open Middle Challenge

### 3D Geometry