(Apologies there was no early access on Patreon–I finished making the video just in time for Pi Day).
Wikipedia
https://en.wikipedia.org/wiki/Area_of_a_circle#Rearrangement_proof
Cut The Knot area of a circle
https://www.cut-the-knot.org/Curriculum/Geometry/AreaOfCircle.shtml
Area of a circle, formula explained (mathematicsonline)
Understanding the Formula for Area of a Circle #shorts (mathematicsonline)
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