Question

4)Nas figuras,a // b// c,calcule o valor de x.​

Answer 1

Nós resolvemos através do Teorema de Tales:

a) $\frac{x}{21}=\frac{4}{12}$

$\frac{x}{21}=\frac{1}{3}$

$x=\frac{1}{3}\cdot 21$

$x=\frac{21}{3}$

$x=7$

b) $\frac{x}{4}=\frac{9}{18}$

$\frac{x}{4}=\frac{1}{2}$

$x=\frac{1}{2}\cdot 4$

$x=\frac{4}{2}$

$x=2$