quick answer:

In=SQRT[(Ia^2+Ib^2+Ic^2)-(Ia*Ib+Ib*Ic+Ic*Ia)]

In=SQRT[(42*42+53*53+41*41)-(42*53+53*41+41*42)]

In=SQRT(6254-6121)=SQRT(133)= 11.5A

So, 25A seems too high.