#$4$ Consider an sentropic compression inlet with $M_D=3\mathrm{.}3,$ We want to make the inlet started by opening the throat

i$)$ what is $(\frac{A_1}{A_{th}}{)}_{\text{d}\text{e}\text{s}\text{i}\text{g}\text{n}}$

ii$)$ what is $(\frac{A_1}{A_{th}^{\text{'}}})$ for starting

$A_{th}^{\text{'}}$ : opened throat area