Question

3)Determine o valor de X

4)Determine o valor de X​

Answer 1

Para resolver um Teorema de Tales basta multiplicar cruzado (regra de três):

3.

$\frac{7}{x} = \frac{5}{9}$

$7 . 9 = 5x$

$63 = 5x$

$x =$ $\frac{63}{5}$

$x = 12,6$ cm

4.

$\frac{x}{14} = \frac{9}{12}$

$12x = 14.9$

$12x = 126$

$x = \frac{126}{12}$

$x = 10,5$ cm