Perhatikan gambar berikut! besar X° + y°+ z° adalah A. 40° B. 50° C. 60° D. 70°

maaf kalo salaaaaaah.....

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

2y = 180 - (80-40)
2y = 180 - 120
2y = 60
y = 60/2
y = 30°

4z = 180 - (2y + 40)
4z = 180 - (2.30 + 40)
4z = 180 - (60 + 40)
4z = 180 - 100
4z = 80
z = 80/4
z = 20°

x + y + z
= 20 + 30 + 20
= 70° (D.)