Question

(FEI – SP) Na figura DE // BC , o valor de x é: *

5 pontos



x = 12

x = 20

x = 15

x = 9

x = 10

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Answer 1

$\large\boxed{\begin{array}{l}\sf\triangle ABC\sim\triangle ADE\\\sf\dfrac{2x+4}{x}=\dfrac{12}{5}\\\sf 12x=10x+20\\\sf 12x-10x=20\\\sf 2x=20\\\sf x=\dfrac{20}{2}\\\sf x=10\end{array}}$