Question

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

Answer 1

equações anexas$a)\\\\\frac{2}{4}  = \frac{12}{21} \\12 = 2x\\x = 6\\\\\\b)\\\frac{4}{x} = \frac{12}{21}  \\12x = 84\\x = \frac{84}{12} \\x = \frac{42}{6} \\x = \frac{21}{3} \\x = 7$