Question

URGENTEEEEEEEE!!!!!!! pergunta na foto URGENTE!!! por favor ​

Answer 1

Resposta:

a) $20\mathrm{cm}$

b) $\dfrac{80\sqrt{3} }{3}$

Resposta passo-a-passo:

Letra A:

$\dfrac{10}{x} =\mathrm{sen}(30^\circ)\to\dfrac{10}{x}=\dfrac{1}{2}\to x=\dfrac{10\cdot2}{1}=20\mathrm{cm}$

Letra B:

$\dfrac{40}{x} =\mathrm{cos}(30^\circ)\to\dfrac{40}{x}=\dfrac{\sqrt{3}}{2}\to x=\dfrac{40\cdot2}{\sqrt{3}}=\dfrac{80}{\sqrt{3}}\cdot\dfrac{\sqrt{3}}{\sqrt{3}} =\dfrac{80\sqrt{3}}{3}\mathrm{cm}$