# Where does pi come from?

See what you think.

Nicely done. Some minor tweaks. Iâ€™d put â€śsidesâ€ť on the slider labels. Maybe a little more explanation of a diagonal, as students might mistakenly think side-side measurement is equivalent to vertex-vertex.

I like the sentence starters (slide 4, 7), and the interactivity of the data collection. I like that the record number of digits of `pi` is `pi*10^13`. If the display of the link bothers you, consider using a URL shortener.

And Iâ€™m stealing slide 22. Thanks!

That reminded me. Something I did not expect happened when they could make the number of sides get really big. On my screen at some point it showed NaN-- but on theirs is said â€śinfinityâ€ť. I would rather have NaN.

And thanks-- great suggestions. It is so cool that their is this community for making stuff better!

Hmmâ€¦ wondering about how to get more explanation for the diagonal. Words only? Some sort of animation? Improve the error check for the table entries??? Thoughts?

Oh, and screen 22 is a copy from Desmosâ€™s starter screens! Such a great resource.

You could make a separate display variable (Iâ€™m not actually looking at your activity), so if n was the number of sides that theyâ€™re adjusting, you could have another for display, n_d, but limit that to whatever large number you want.

`n_d=n {n<=10^100}`

So, theyâ€™ll able to adjust n as much as they want, but use n_d for display and itâ€™ll show NaN if they go above your designated value. Here, 10^100.

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