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n = 40 kali
s = 52, 8 m -> 5280 cm
diselesaikan dgn menggunakan rumus kll= s : n
kll = s : n
2. phi. r = 5280 : 40
2. 22/7 . r = 132
44.r = 132 × 7
r = 924:44
r = 21 cm
semiga membantu ^-^
52,8 m = K x 40
5280 cm = K x 40
K = 5280/40 = 132 cm
K = 132
2πr = 132
r = 132/2π
r = 132/2 x 22/7
r = 132/2 x 7/22
r = 21