Question

2-
Sabendo que os triângulos abaixo são semelhantes, qual o valor de x?
10 cm
9 cm
6 cm

Answer 1

Resposta:

Explicação passo a passo:

  $\frac{10}{x} =\frac{6}{9}$

$6\:.\:x=10\:.\:9$

  $6x=90$

    $x=90/6$

    $x=15\:cm$

Answer 2

$\large\boxed{\begin{array}{l}\sf\triangle D~\!\!EF\sim\triangle ABC (caso\,AA)\\\sf\dfrac{DF}{AC}=\dfrac{DE}{AB}\\\\\sf\dfrac{x}{10}=\dfrac{9}{6}\\\\\sf 6x=90\\\sf x=\dfrac{90}{6}\\\\\sf x=15\,cm\end{array}}$