And how do you know?

Here's a response:

- Is this a valid way to get one-third of the triangle?
- Does this technique
that we stipulate a right triangle?**require** - Does this technique
that we stipulate an isosceles one?**require** - Do the lines have to be parallel to each other?
- Do the lines have to be parallel to a side for this to work?
- Perpendicular to a side for this to work?

- How might we generalize this method (if it can be generalized)?

```
Try to shade 1/3 of this triangle. How do you know it is 1/3? #mathchat #elemmathchat pic.twitter.com/KaLtPglBfV
— David Wees (@davidwees) May 2, 2015
```

```
@davidwees this may be more than you want pic.twitter.com/Azlkv1kwAw
— David Sawtelle (@davesawtelle) May 2, 2015
```

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