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4x + 30 + x = 180
5x = 150
x = 30
b) A1 = 4x + 30
= 120 + 30
= 150
c) A2 = A4
= x
= 30
d) A3 = A1
= 150
e) A4 = x
= 30
f) B1 = A1
= 150
g) B2 = A2
= 30
h) B3 = A3
= 150
i) B4 = A4
= 30
5x + 30 = 180
5x = 150
x = 30
2.sudut A1 = 4(30 ) + 30 = 150
3.sudut A2 = 180 - 150 = 30
4. sudut A3 = 150
5. sudutt a4 = 30
6. sudut b1 = 150
7. sudut b2 = 30
8.sudut b3 = 150
9. sudut b4 = 30