Question

10 6
x 4
teorema de Tales ​

Answer 1

Olá!

$\frac{10}{x} = \frac{6}{4} \\ \\ 10\cdot4 = 6\cdot x \\ 40 = 6x \\ \frac{ {40}^{\color{red} { \div 2}} }{ {6}^{\color{red} { \div 2}} } = x \\ \\ \boxed{ \bf{x = \frac{20}{3} } }$

Espero ter ajudado! :)