Question

teorema de tales, calcule o x​

Answer 1

Resposta:

x=7

Explicação passo-a-passo:

regra de 3

4    x

12  21

12x=21 . 4

12x=84

x= 84/12

x=7

Answer 2

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