# What Makes a Triangle a Triangle?

- Author:
- Natalie Norris

## Can we use any three side lengths to make a triangle?

Try rearranging the lengths below to create a triangle.
Use the green dots to rotate the segments and the blue dots to move the segments.
Does it work? Why or why not?

## What segment lengths DO make a triangle?

Use the green dots to change the length and position of sides a and b.
Write down THREE side length combinations for sides a and b that work and three that do not work to make triangle ABC.
Add these combinations together, do you notice anything?

## At what point does the triangle stop being a triangle?

Use the green dot to change the dimensions of the triangle.
Where is it NOT a triangle?
At what point does it stop being a triangle?