Question

alguem pode me ajuda ​

Answer 1

7)

$\frac{1}{2} = \frac{x}{5}\\\\2x = 5\\\\x = 2,5$

8)

Cateto x

$\frac{1}{2} = \frac{x}{100}\\\\x = 50$

Cateto y (Por tangente, pitágoras é possível também)

$tg30 = \frac{50}{x}\\\frac{\sqrt{3}}{3} = \frac{50}{x}\\x = \frac{150}{\sqrt{3}} \cdot \frac{\sqrt{3}}{\sqrt{3}}\\x = \frac{150\sqrt{3}}{3}\\x = 50\sqrt{3}$

9)

$sen40 = \frac{x}{10}\\\\0,64 = \frac{x}{10}\\\\x = 6,4m$