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Taking the origin as the inversion center, Archimedes'

**spiral**r=atheta inverts to the hyperbolic**spiral**r=a/theta.The tractrix

**spiral**is a**spiral**with parametric equations x(t) = acostcos(t-tant) (1) y(t) = acostsin(t-tant) (2) for t in [0,pi/2). It is also known as the polar tractrix or ...Nielsen's

**spiral**, also called the sici**spiral**(von Seggern 1993) is the**spiral**with parametric equations x(t) = aci(t) (1) y(t) = asi(t), (2) where ci(t) is the cosine ...The Galilean

**spiral**is the curve with polar equation r=btheta^2-a for a>0 which describes the trajectory of a point uniformly accelerated along a line rotating about a point.Fermat's

**spiral**, also known as the parabolic**spiral**, is an Archimedean**spiral**with m=2 having polar equation r^2=a^2theta. (1) This curve was discussed by Fermat in 1636 ...An Archimedean

**spiral**with polar equation r=a/theta. (1) The hyperbolic**spiral**, also called the inverse**spiral**(Whittaker 1944, p. 83), originated with Pierre Varignon in ...The Atzema

**spiral**, also known as the Pritch-Atzema**spiral**, is the curve whose catacaustic for a radiant point at the origin is a circle, as illustrated above. It has ...The conical

**spiral**with angular frequency a on a cone of height h and radius r is a space curve given by the parametric equations x = (h-z)/hrcos(az) (1) y = (h-z)/hrsin(az) ...The catacaustic of a logarithmic

**spiral**, where the origin is taken as the radiant point, is another logarithmic**spiral**. For an original**spiral**with parametric equations x = ...The length of the polygonal

**spiral**is found by noting that the ratio of inradius to circumradius of a regular polygon of n sides is r/R=(cot(pi/n))/(csc(pi/n))=cos(pi/n). (1) ......