diketahui gambar berikut. nilai x + y + z pada gambar di atas adalah.. dgn cara ya tolong

7x° + 40° = 180°
7x° = 180° - 40°
= 140°
x = 140°/7
= 20°

4z° = 80°
z = 80°/4
= 20°

2y° + 4z° + 40° = 180°
2y° + 4×20° = 180° - 40°
2y° + 80° = 140°
2y° = 140° - 80°
2y° = 60°
y = 60°/2
= 30°

x + y + z = 20° + 30° + 20° = 70°
Jadi nilai x + y + z adalah 70°