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10x = 180
x = 18
2x = 2 . 18
= 36
3x = 3 . 18
= 54
5x = 5 . 18
= 90
180/2+3+5=180/10=18
sehingga = a=2.18=36 , b=3.18= 54 , c=5.18=90
ditotalkan tetap 180 derajat,thanks