This is the answer. please show me the full workout thanks

Table for question $3$: Geometrical characteristics of the Circular Hollow Section $($CHS$)$

Endpoint answer:

Effective length $=10m$

There is no need to check the $7$ m case as the cross section is circular with the same $I_x,I_y,$ so

long effective length will govern.

$I=44870837\mathrm{.}73m{m}^4$

$A_g=5032\mathrm{.}83m{m}^2$

$r=94\mathrm{.}42mm$

$1$

${}_e=<msub><mrow><mi></mi></mrow><mrow><mi>e</mi><mi>y</mi></mrow></msub>$

$A_e=A_g{k}_f=1\mathrm{.}0$

Also, alternatively, Table $6\mathrm{.}3\mathrm{.}3(1)$ NZS $3404$ says $k_f=1\mathrm{.}0$ for hot rolled $($HR$)$ circular hollow

section $($CHS$)$

$5^{\text{'}}$

Given there is no hole, $A_n=A_g=A_e$

$N_s=1610\mathrm{.}5kN$

${}_n=119\mathrm{.}8$

${}_b=-1$ as per Table $6\mathrm{.}3\mathrm{.}3(1)$ NZS$3404$

$2^{\text{'}}$

${}_c=0\mathrm{.}51$ as per Table $6\mathrm{.}3\mathrm{.}3(2)$ NZS$3404$ through interpolation

$N_c=823\mathrm{.}7kN$

$N^{*}741\mathrm{.}3kN$