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sudut = 2/3x
90 = x + 2/3x
90 = 3/3x + 2/3x
90 = 5/3x
x = 90 : 5/3
x = 90 x 3/5
x = 270/5
x = 54
besar sudut itu = 2/3x = 2/3 × 54 = 2 x 18 = 36 derajat
besar komplemen = x = 54 derajat
= 90 - 60
= 30