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panjang busur = 90/360 x 2 x pi x r
55 = 1/4 x 2 x 22/7 x r
55 = 22/14 x r
55 x 14 /22 = r
35 = r
Keliling Lingkaran / Panjang lingkaran = 2 x 22/7 x 35 = 220 cm