Resistance of side AB=R1=A3ρ Resistance of side BC=R2=A4ρ Resistance of side AC=P3=A5ρ (Where A= Area of cross-section and ρ= resistivity of wire) 
∴ The resistance between A and B is RAB=R1+R2+R3R1(R2+R3)=A3ρ+A4ρ+A5ρA3ρ(A4ρ+A5ρ)=12A27ρ Similarly RBC=R1+R2+R3R2(R1+R3)A3ρ+A4ρ+A5ρA4ρ(A3ρ+A5ρ)=1232Aρ And RAC=R1+R2+R3R3(R1+R2)=A5ρ+A3ρ+A4ρA5ρ(A3ρ+A3ρ)=1235Aρ∴RAB:RBC:RAC=1227:1232:1235=27:32:35
