Question

Calcule a medida do ângulo x,sabendo que r//s

Answer 1

$\mathsf{x+38^{\circ}+40^{\circ}+55^{\circ}=180^{\circ}}\\\mathsf{x+133^{\circ}=180^{\circ}}\\\mathsf{x=180^{\circ}-133^{\circ}=47^{\circ}}}$