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10 cards from this deck
Distance from centre to edge of circle
Distance across circle through centre
Distance around the edge of a circle
d=2rd = 2rd=2r
C=πdC = \pi dC=πd
C=2πrC = 2\pi rC=2πr
3.142
Only at the final step
d=Cπd = \frac{C}{\pi}d=πC
r=C2πr = \frac{C}{2\pi}r=2πC
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