Question

Nas figuras, a // b // c, calcule o valor de x

Answer 1

Resposta:

4/12 = x/21

12x = 84

x= 84/12

x = 7

Espero ter ajudado!bons estudos!

Answer 2

$\large \boxed{ \begin{array}{l} \underline{ \sf teorema \: de \: tales} \\ \\ \dfrac{4}{12} = \dfrac{x}{21} \\ \\ \\ 12x = 4 \times 21 \\ 12x \: = \: 84 \\ x = 84 /12 \\ \boxed{ \boxed{x = 7}}\end{array}}$