Respostas

2014-04-30T19:44:29-03:00
 \frac{h}{40}  =tg30\\\\
 \frac{h}{40} =  \frac{ \sqrt{3} }{3} \\\\
h =  \frac{40 \sqrt{3} }{3} = 23,09 m
23,09 m + 1,68 m = 24,77 metros
Alternativa d)