Configuration

Circuit of 3 resistors connected like a pie π

I_R1 = I_R2 + I_R3

${\displaystyle {\frac {v_{i}}{R_{1}}}={\frac {v_{i}-v_{o}}{R_{2}}}+{\frac {v_{o}}{R_{3}}}}$

${\displaystyle {\frac {v_{i}}{v_{o}}}=({\frac {R_{3}}{R_{1}}})({\frac {R_{2}-R_{1}}{R_{2}-R_{3}}})}$

${\displaystyle {\frac {v_{o}}{v_{i}}}=({\frac {R_{3}}{R_{1}}})({\frac {R_{2}-R_{1}}{R_{2}-R_{3}}})}$