Respostas

  • Usuário do Brainly
2014-09-04T16:16:37-03:00
A)
sen30°= \frac{x}{30}

 \frac{1}{2} = \frac{x}{30}

2x=30
x=30÷2
x=15

b)
tg60°= \frac{z}{20}

 \sqrt{3} = \frac{z}{20}

z=20√3

c)
cos15°= \frac{y}{16}

0,96= \frac{y}{16}

y=16.0,96
y≈15,36