# Open Middle Challenge: Parallel Lines and Related Angles

- Author:
- Tim Brzezinski

- Topic:
- Angles, Geometry, Straight Lines, Triangles

## Your task:

## Without repeating digits, change the input boxes on the left try to make lines a and b parallel and the rest of the diagram true. The picture on the right IS drawn to scale. LARGE POINTS are also moveable.

Where would it **not** be ideal to put a 0? Why is this?

Where would it **not** be ideal to place a 5? Why is this?

What other frustrations or roadblocks did you run into while attempting the problem above? Explain.