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(n x r) + (2 x phi x r)
p = panjang lilitan
r = jari-jari lingkaran
n = banyaknya jari-jari lingkaran yang kena tali jika titik pusatnya dihubungkan.
jawab
= ( 24 x 20 ) + ( 2 x 3,14 x 20 )
= 480 + 125,6
= 605,6cm