Question $1(2\mathrm{.}5$ points$)$

Given

The simply$-$supported beam shown in the diagram is subjected to three point loads.

P$\_(1)=28\mathrm{.}0$kN

P$\_(2)=12\mathrm{.}0$kN

P$\_(3)=7\mathrm{.}0$kN

The connecting pin in the pin support, B is made of Ti$-6$Al$-4$V$,$ annealed titanium

alloy, and is in double shear.

Required

What is the minimum diameter of pin required in the pinned connection in mm to the

nearest $10$th$,$ i$.$e$.,$ one $(1)$ decimal place.