Q$\mathrm{.}2\mathrm{.}3$ Figure $2\mathrm{.}3($below$)$ is a generic representation of a parametric sizing chart indicating a series of design requirements for a jet aeroplane. Reproduce the figure in your examination book and indicate on the figure: $($a$)$ the area where all requirements are met; and $($b$)$ the optimum design point.

$(3$ marks$)$

Landing requirement

Takeoff wing loading

Fig. $2\mathrm{.}3$ Parametric sizing chart for a generic jet aeroplane