Let z1 = 10 + 6i and z2 = 4 + 6i. If z is any complex number such that the argument of (z - z1) / ..

Let z1 = 10 + 6i and z2 = 4 + 6i. If z is any complex number such that the argument of (z - z1) / (z - z2) is pi/4, then find the length of arc of the locus.