What is the length of a belt with diameter d1 and d2 and at distance x apart, is connected by means of an open belt drive?
1
\(\frac{\pi }{2}\left( {{d_1} + {d_2}} \right) + 2x + \frac{{{{\left( {{d_1} + {d_2}} \right)}^2}}}{{4x}}\)
2
\(\frac{\pi }{2}\left( {{d_1} - {d_2}} \right) + 2x + \frac{{{{\left( {{d_1} - {d_2}} \right)}^2}}}{{4x}}\)
3
\(\frac{\pi }{2}\left( {{d_1} + {d_2}} \right) + 2x + \frac{{{{\left( {{d_1} - {d_2}} \right)}^2}}}{{4x}}\)
4
\(\frac{\pi }{2}\left( {{d_1} - {d_2}} \right) + 2x + \frac{{{{\left( {{d_1} + {d_2}} \right)}^2}}}{{4x}}\)
5
\(\frac{\pi }{2}\left( {{d_1} - {d_2}} \right) - 2x + \frac{{{{\left( {{d_1} + {d_2}} \right)}^2}}}{{4x}}\)