For

$1\mathrm{.}9$ cm$,$

$10\mathrm{.}6$ cm$,$

$3\mathrm{.}7$ cm$,$

$8\mathrm{.}0$ kN$,$

$2\mathrm{.}0$ kN$,$ and

$15\mathrm{.}5$ kN in the figure below, what is the absolute maximum shear stress at A in units of MPa?sesston $\frac{?}{{?}_0}$

For $a=1\mathrm{.}9cm,b=10\mathrm{.}6cm,c=3\mathrm{.}7cm,P_x=8\mathrm{.}0kN,P_y=2\mathrm{.}0kN,$ and $P_z=15\mathrm{.}5kN$ in the figure

below, what is the absolute maximum shear stress at $A$ in units of MPa $?$