[tex]sin70 = \frac{a}{60} \\ 0.9397 = \frac{a}{60} \\ 60 \times 0.9397 = a \\ a = 56.382 \\ \\ cos70 = \frac{b}{70} \\ 0.3420 = \frac{b}{70} \\ 70 \times 0.3420 = b \\ b = 23.94 \\ \\ ob = 2a + 2b \\ ob = 2 \times 56.382 + 2 \times 23.94 =112.764 + 47.88 = 160.644 = 161[/tex]
Obwód tego prostokąta wynosi 161m
