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= 42 + 44 = 86 cm
2. Panjang tali = 2 d + Keliling
144 = 2 ( 2 r) + 2 r 3,14
144 = 2r ( 2 + 3,14)
144 = 2r ( 5,14)
28,016 = 2r
r = 14,008 cm