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AB/2Πr=72/360
AB/2×22/7×35=72/360
AB/2×22/7×7=72/360
AB=72/360 ×2×22×7
AB=72/360×308
AB=22176/360
AB=22176÷360
AB=?
KO= Keliling lingkaran
Berlaku penyederhanaan . Garis miring artinya per. AB itu busurnya