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x = 40
y = 180 - (x+80) ------> sudut saling berpelurus (suplemen)
y = 180 - 120
y = 60
d. x= 180-102 -----> pelurus dari sehadap x
= 78
e. 5x = 180 -80 ---> sudut saling pelurus
5x = 100
x = 20
7y pelurusnya 5x
7y = 180-5x
= 180-100
= 80
y = 80/7