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r = jari-jari lingkaran
n = banyaknya jari-jari lingkaran yang kena tali jika titik pusatnya dihubungkan.
rumus
p = nr + 2πr
p = 12 . 24 cm + 2 x 3,14 x 24 cm
p = 288 cm + 150,72 cm
p = 438,72 cm