Question

Calcule x abaixo!!!!!!!!!

Answer 1

A)

$si = (n - 2) \times 180 \\ si = (6 - 2) \times 180 \\ si = 4 \times 180 \\ si = 720$

$3x + x + 20 + x + 30 + 70 = 720 \\ 3x + x + x = 720 - 120 \\ 5x = 600 \\ x = \frac{600}{5} \\ x = 120$

B)

$y + 130 = 180 \\ y = 180 - 130 \\ y = 50 \\ \\ x + x + 20 + 100 + 90 + 50 = 540 \\ 2x = 540 - 260 \\ 2x = 280 \\ x = \frac{280}{2} \\ x = 140$