PLEASE PROVIDE FULL WRITTEN SOLUTION FOR THUMBS UP$.$ I got my i$)$ as $256303$mm$^4$ not sure if it correct could you propf it i also have no idea how to do part ii

A cross$-$sectional profile is shown in Figure Q$1($b$).$ Determine:

$($i$)$ its $2^{nd}$ moment of area with respect to its horizontal centroidal axis, and

$($ii$)$ its $2^{nd}$ moment of area with respect to $x$ axis.

Figure Q$1($b$)$

All dimensions in mm