solve for r:d=rR2/R2+R1
d=rR2/(R2+R1)d(R2+R1)=rR2[d(R2+R1)]/R2 = r
Answer:
Step-by-step explanation: this involves change of subject of formula
Given d=rR2/R2+R1
d-R1=rR2/R2
Crosss multiplying
( d-R1)R2=rR2
Divide both sides by R2
r=d-R1