SOLUTION: solve E/e=(R+r)/r, solve for r E/e =(R/r)+1 R/r=(E/e)-1 R/r = (E-e)/e r/R=e/(E-e) r=Re/(E-e) Cheers, Stan H.

Algebra ->  Equations -> SOLUTION: solve E/e=(R+r)/r, solve for r E/e =(R/r)+1 R/r=(E/e)-1 R/r = (E-e)/e r/R=e/(E-e) r=Re/(E-e) Cheers, Stan H.      Log On


   

Question 39812: solve E/e=(R+r)/r, solve for r
E/e =(R/r)+1
R/r=(E/e)-1
R/r = (E-e)/e
r/R=e/(E-e)
r=Re/(E-e)
Cheers,
Stan H.
Found 2 solutions by fractalier, stanbon:
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Takes a little fancy dancing...watch it step-by-step...
E/e = (R+r)/r
cross-multiply
rE = e(R + r)
rE = eR + er
rE - er = eR
r(E - e) = eR
r = eR / (E - e)

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
E/e =(R/r)+1
R/r=(E/e)-1
R/r = (E-e)/e
r/R=e/(E-e)
r=Re/(E-e)
Cheers,
Stan H.