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13 cards from this deck
Shape where all edge points are equal distance from centre
Distance from centre to edge (rrr)
Distance across circle through centre
Diameter = 2imes2 imes2imes radius
πr2\pi r^2πr2
2πr2\pi r2πr
Slice of circle between two radii and arc
x360×πr2\frac{x}{360} \times \pi r^2360x×πr2
x360×2πr\frac{x}{360} \times 2\pi r360x×2πr
Fraction of complete circle that sector represents
πr22\frac{\pi r^2}{2}2πr2
πr24\frac{\pi r^2}{4}4πr2
Break into simple parts, calculate each, add together
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