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4a= 180
a= 180/4
a= 45
Sudut ABD= 3a= 3×45= 135
b+b+b= 180
3b=180
b= 180/3
b= 60
Sudut DEG= b= 60
3c+45+30=180
3c+75= 180
3c= 180-75
3c= 105
c= 105/3
c= 35
Sudut PQS= 3c+45= 3×35+45= 150
4d+60+d= 180
5d+60= 180
5d= 180-60
5d= 120
d= 120/5
d= 24
Sudut KLN= 4d+60= 4×24+60= 96+60= 156