Question

11) Calcule o valor de x: a) b) C) d) х 42 60° x+10° x Х 420 54° 710 40° 70°​

Answer 1

$\large\boxed{\begin{array}{lr}a) \\ x + 54 + 42 = 180 \\ x + 96 = 180 \\ x = 180 - 96 \\ x = 84° \\ \\ b) \\ x + 60 + 40 = 180 \\ x + 100 = 180 \\ x = 180 - 100 \\ x = 80° \\ \\ c) \\ x + x + 10 + 70 = 180 \\ 2x + 80 = 180 - 80 \\ 2x = 100 \\ x = \frac{100}{2} \\ x = 50° \\ \\ d) \\ x + 71 + 42 = 180 \\ x + 113 = 180 \\ x = 180 - 113 \\ x = 67°\end{array}}$