STROPHOID
Angle trisection curve
a (fixed pt)
1.00
oblique angle
0°
Right strophoid:
x = a(t²−1)/(t²+1), y = at(t²−1)/(t²+1)
y² = x²(a+x)/(a−x)
Trisects angle at O via
intersections of secants
Node at origin. Asymptote x=a.
Loop for x∈[−a,0].
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