The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by (where, x = each side of the square duct) ? August 27, 2021March 10, 2019 by admin The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by (where, x = each side of the square duct) ? A. x B. √(πx) C. √(2x) D. √(x/2)