[ot][ot][ot][personal] whirligig small thoughts

[Undescribed Horrific Abuse, One Victim & Survivor of Many]

... - the circumference is 2 pi r, where r is the distance from the axis
2 pi r is proportional to r

so the thickness statement passes 1 check (unless this is second don't
think it is?), i kinda need 3 checks i'm so error-prone, but it makes
sense to check by trying assuming it