Sudut pusat = 2 × sudut keliling
4x - 20 = 2 × 50
4x - 20 = 100
4x = 100 + 20
4x = 120
x = 120/4
x = 30°
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Sudut pusat = 2 × sudut keliling
4x - 20 = 2 × 50
4x - 20 = 100
4x = 100 + 20
4x = 120
x = 120/4
x = 30°