Respuesta :

B = (1/6).π.x².s

1st Multiply both sides with 6 → 6B = (6).(1/6).π.x².s. Simplify by 6
6B = π.x².s. Now divide both sides by .π.x².
6B/(.π.x²)  =  .(π.x².s)/(.π.x²) After simplification you get:

6B/(.π.x²) = s →  s = 6B/(.π.x²)