S.93 T.252

$180°-\left(33°+61°\right)=86°$
b)
$\frac{7}{\sin61}=\frac{x}{\sin33}$
$\sin61x=3{,}812...$
$x=4{,}359...\approx4{,}4\left(cm\right)$

$BC\approx4{,}4cm$

$\frac{7}{\sin61}=\frac{y}{\sin86}$
$\sin61y=6{,}982...$
$y=7{,}983...\approx8{,}0\left(cm\right)$
$AB\approx8{,}0cm$