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Day one of big #Mathsjam has been a big overwhelming blob of fun and also overstimulation. I'm running a Circle Theorem Badges table this evening helping people make badges with their favourite circle theorem on. And then hoping to chill out with some craft - I'd love to go to Mathsjam Jam but I suspect it would be Too Much 
@alisonkiddle so many great circle theorems!! Here are several favorites...
https://karendcampe.wordpress.com/2022/06/29/circles-are-all-right/
@alisonkiddle what's a circle theorem? a theorem about circles? the my favorite is Descartes's that if you have 4 mutually kissing circles, their curvatures (inverses of radii) satisfy the relation
@antoinechambertloir ah it's the collective name used in the English school curriculum for simple proofs in circle geometry such as these: https://thirdspacelearning.com/gcse-maths/geometry-and-measure/circle-theorems.
@antoinechambertloir I suspect I've seen that Descartes theorem before but had forgotten it; thank you for sharing!
@alisonkiddle this sounds ideal, I feel like mathsjam might be the tribe I didn't know I was missing. Very adjacent to the playful learning association, so I'll do what I can to intersect the superset.
@bocs check out mathsjam.com to find out about monthly mathsjam meetups to see if there's one near you, and I think you can sign up to a mailing list to be alerted when bookings open for next year's annual gathering 
@alisonkiddle roger wilco check