$6\mathrm{.}6$ Determine the largest tensile and compressive forces that occur in the members of the truss, and indicate the members in which they occur if

$($a$)$ the dimension $h=0\mathrm{.}1m$;

$($b$)$ the dimension $h=0\mathrm{.}5m.$

Observe how a simple change in design affects the maximum axial loads.