Question

aplique o teorema de tales

Answer 1

10 + 4 = 14

Regra de três:

$\frac{4}{c} = \frac{14}{21} \\\\14c = 84\\\\c = \frac{84}{14} \\\\c = 6$

C + X = 21

6 + x = 21

x = 21 - 6

x = 15

C = 6

X = 15

Bons estudos!