Form
Readouts
k = n/d
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Petals
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Period
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Current theta
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Enclosed area
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r = a cos(k theta), k = p/q in lowest terms. Closes after theta = q*pi (p*q odd) or 2*q*pi (even). Petals: p if p*q odd else 2p. Area = (1/2) integral r^2 dtheta over the period.