Odpowiedź:
D
Szczegółowe wyjaśnienie:
[tex]\sin46^\circ=\frac{8}{a}\ |*a\\a*\sin46^\circ=8\ |:\sin46^\circ\\a=\frac{8}{\sin46^\circ}\\a\approx\frac{8}{0,7193}\approx11,122\\\\\text{tg }46^\circ=\frac{8}{b}\ |*b\\b*\text{tg }46^\circ=8\ |:\text{tg }46^\circ\\b=\frac{8}{\text{tg }46^\circ}\\b\approx\frac{8}{1,0355}\approx7,726\\\\Obw=4a+2b=4*11,122+2*7,726=44,488+15,452=59,94\approx60[/tex]
