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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
ฯr2\pi r^2ฯr2
2ฯr2\pi r2ฯr
Slice of circle between two radii and arc
x360รฯr2\frac{x}{360} \times \pi r^2360xโรฯr2
x360ร2ฯr\frac{x}{360} \times 2\pi r360xโร2ฯr
Fraction of complete circle that sector represents
ฯr22\frac{\pi r^2}{2}2ฯr2โ
ฯr24\frac{\pi r^2}{4}4ฯr2โ
Break into simple parts, calculate each, add together
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