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Circle Involute Pedal Curve

\begin{figure}\begin{center}\BoxedEPSF{CircleInvolutePedal.epsf scaled 700}\end{center}\end{figure}

The Pedal Curve of Circle Involute

\begin{eqnarray*}
f&=&\cos t+t\sin t\\
g&=&\sin t-t\cos t
\end{eqnarray*}



with the center as the Pedal Point is the Archimedes' Spiral

\begin{eqnarray*}
x&=&t\sin t\\
y&=&-t\cos t.
\end{eqnarray*}






© 1996-9 Eric W. Weisstein
1999-05-26