Question

me ajudem por favor 12 pontos

1-    Calcule o seno e o cosseno do ângulo abaixo na imagem

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Answer 1

Resposta:

Explicação passo-a-passo:

$sen\ 30\º=\frac{x}{12\sqrt{3}} \\\frac{1}{2} =\frac{x}{12\sqrt{3}} \\\\2\cdotx=1\cdot12\sqrt{3}\\\\2\cdotx=12\sqrt{3}\\\\x=\frac{12\sqrt{3}}{2}\\\\x=6\sqrt{3}$

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$cos\ 30\º=\frac{y}{12\sqrt{3}} \\\frac{\sqrt{3}}{2} =\frac{y}{12\sqrt{3}} \\\\2\cdot y=\sqrt{3}\cdot12\sqrt{3}\\2y=12\sqrt{3\cdot3}\\2y=12\sqrt{9}\\2y=12\cdot3\\2y=36\\y=\frac{36}{2}\\ y=18$