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90 + 90 + x + 5x = 360 (1 lingkaran penuh)
180 + 6x = 360
6x = 180
x = 30
AOC = 90 + x
AOC = 90 + 30
AOC = 120
maka
= 90 + (270 - (90 + x + 5x)
= 90 + (270 - 90 - 6x)
= 90 + (180 - 6x)
= 270 - 6x
6x =270
x=45 derajat
jadi AOC= 90+45=135 derajat (C)