$(10$ points$)$ Determine the effective net area for WT sections

$($cross$-$sectional area $9\mathrm{.}54i{n}^2,$ flange width $12in,$ and flange

thickness $0\mathrm{.}605in.)$ welded to a guest plate in the following two

ways: $($a$)$ with welds on all sides of the flange $($uniform $12$ in$.$

welds on longitudinal directions$)$ and $($b$)$ with $6$ in$,$ and $18$ in$.,$

flange.

$($b$)$