Symbol
$A_{\mathrm{d}}$
Unit
mm²
Formulae
$\frac{\pi}{4} \left(- Di_{\mathrm{d}}^{2} + Do_{\mathrm{d}}^{2}\right)$
Related
$Di_{\mathrm{d}}$
$Do_{\mathrm{d}}$
Used in
$Q_{\mathrm{d}}$