Brick Arch Shape Thoughts

I made a polar plot with Racket to thing about wedge angles for a brick oven dome:

I don't know what sort of units are for setting up the tool my neighbor will use to mak the wooden wedges.. But for the Racket plot language `polar function¹ it seems easy: There are 15 bricks so I guess it pi/15 ? but is the angle from the center the same as the angle between neighboring bricks? I have to think oon it some more. It was fun to make the image though...

We can check it by using a nail and string anyway:²

And... I made a Japanese version of my brick arch illustration too..

[File: 8cbdcb7b-f208-4387-8b17-d2d109754938]

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