Question

Alguém sabe resolver??

Answer 1

Resposta:

$\tan(30) = \frac{18}{c} \\ \tan(30) = \frac{ \sqrt{3} }{3} \\ \frac{ \sqrt{3} }{3} = \frac{18}{c} \\ c \times \sqrt{3} = 18 \times 3 \\ c \times \sqrt{3} = 54 \\ \sqrt{3} = 1.73 \\ c = \frac{54}{1.73} \\ c = 31.21$

Alternativa D