\(\,\left( {\,\because \,\,\alpha  = \frac{l}{r}\,} \right)\,\,\,\)

અને \({R_{XZY}} = \frac{R}{{2\pi r}} \times r(2\pi  - \alpha ) = \frac{R}{{2\pi }}(2\pi  - \alpha )\)

\(\therefore {R_{eq}} = \frac{{{R_{XWY}}\,{R_{XZY}}}}{{{R_{XWY}} + {R_{XZY}}}}\)

\( = \frac{{\frac{{R\alpha }}{{2\pi }} \times \frac{R}{{2\pi }}(2\pi  - \alpha )}}{{\frac{{R\alpha }}{{2\pi }} + \frac{{R(2\pi  - \alpha )}}{{2\pi }}}}\,\)

\( = \frac{{R\alpha }}{{4{\pi ^2}}}(2\pi  - \alpha )\)