Question

1) Nas figuras, a / b // c, calcule o valor de x. 4 х 2. 3 12 21 (A) (B)​

Answer 1

Vamos lá!

Aplicar o Teorema de Tales:

(A)

$\frac{2}{4} = \frac{3}{x} \\ \\ 2x = 4 \times 3 \\ 2x = 12 \\ x = \frac{12}{2} \\ \blue{\boxed{\boxed{x = 6}}}$

(B)

$\frac{4}{12} = \frac{x}{21} \\ \\ 12x = 4 \times 21 \\ 12x = 84 \\ x = \frac{84}{12} \\ \blue{\boxed{\boxed{x = 7}}}$