Cross-sectional area of 2nd armour

Symbol
$A_{a_{2}}$
Unit
mm$^2$
Formulae
$\frac{d_{f_{2}}^{2} n_{a_{2}} \pi}{4}$round wires
$d_{f_{2}} n_{a_{2}} w_{f_{2}}$flat wires
$\pi \left(- \left(\frac{d_{a_{2}}}{2} - \frac{d_{f_{2}}}{2}\right)^{2} + \left(\frac{d_{a_{2}}}{2} + \frac{d_{f_{2}}}{2}\right)^{2}\right)$TECK, steel tapes
Related
$A_{a_{1}}$
$d_{f_{2}}$
Used in
$A_{a}$
$m_{a_{2}}$
$R_{A_{2}}$