Question

PFVR ALGUEM RESPONDE O MAIS RÁPIDO POSSIVEL ​

Answer 1

Resposta:

Explicação passo-a-passo:

Lembrando que o cosseno é:

$cos=\frac{cateto \: adjacente}{hipotenusa}$

1.

$cos 45 = \frac{ca}{hi} =\frac{x}{10} \\\\\frac{x}{10} =\frac{\sqrt{2} }{2} \\\\2x=10\sqrt{2} \\\\x=5\sqrt{2}$

2.

$cos30=\frac{ca}{hi} =\frac{x}{60} \\\\\frac{x}{60} =\frac{\sqrt{3} }{2} \\2x=60\sqrt{3} \\\\x=30\sqrt{3}$

3.

$cos60=\frac{ca}{hi} =\frac{x}{350} \\\\\frac{x}{350}=\frac{1}{2} \\\\2x=350\\\\x=175$

Espero ter ajudado!