Question

calcule os valores das incógnitas nos triângulos semelhantes:

Alguém sabe pfvrrrr

Answer 1

$a) \: \: \frac{x}{5} = \frac{4}{2} \\ \\ 2x = 4 \times 5 \\ 2x = 20 \\ x = 20 \div 2 \\ x = 10$
$b) \: \: \frac{2}{5} = \frac{x}{9} \\ \\ 5x = 2 \times 9 \\ 5x = 18 \\ x = 18 \div 5 \\ (x = 3.6) \\ \\ \frac{2}{3} = \frac{3.6}{y} \\ \\ 2y = 3.6 \times 3 \\ 2y = 10.8 \\ y = 10.8 \div 2 \\ y = 5.4$