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α/360 = panjang busur/keliling lingkaran
α/360 = 66/7 / 2πr
a/360 = 66/7 / 2 x 22/7 x 4
α/360 = 66/7 / 176/7
α/360 = 66/7 x 7/176
α/360 = 66/176
α = 66 x 360 : 176
α = 135 derajat