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13 cards from this deck
Distance from centre to edge; half the diameter
Distance across through centre; twice the radius
Distance around the edge (perimeter of circle)
Diameter = 2 × radius
C=πdC = \pi dC=πd
C=2πrC = 2\pi rC=2πr
3.142
Special mathematical constant ≈ 3.141592...
Diameter is given
Radius is given
Don't round until end to prevent errors
Use π button (may need SHIFT)
Units are correct (cm, m, etc.)
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