Question

aplique o teorema de tales para determinar o valor de x , sabendo que as retas a,b e c são paralelas​

Answer 1

$\frac{5}{x} = \frac{8}{12} \\ 8x = 60 \\ x = \frac{60}{8} = 7.5$

Answer 2

$\mathsf{ \dfrac{x}{12}=\dfrac{5}{5+3}}$

$\mathsf{8x=60}$

$\mathsf{x=\dfrac{60}{8} }$

$\boxed{\boxed{ \mathsf{x=7{,}5}} }$