Question

Determine o valor de X nos Triângulos:​

Answer 1

$\boxed{\begin{array}{lr}a) \\ x + 25 + 75 = 180° \\ x + 100 = 180° \\ x = 180 - 100 \\ x = 80° \\ \\ b) \\ x + 72 +38 = 180° \\ x + 110 = 180 ° \\ x = 180 - 110 \\ x = 70° \\ \\ c) \\ 3x + 2x + 120 = 180° \\ 5x + 120 = 180° \\ 5x = 180 - 120 \\ x = 60 \\ x = \frac{60}{5} \\ x = 12° \\ \\ d) \\ 4x + 3x + 40 = 180° \\ 7x + 40 = 180° \\ 7x = 180 - 40 \\ x = 140 \\ x = \frac{140}{7} \\ x = 20°\end{array}}$