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L = π × r²
1386 = 22/7 × r²
r² = 1386 × 7/22
r² = 441
r = 21
K = 2 × π × r
K = 2 × 22/7 × 21
K = 132
jarak 4 m
132/4 = 33
Banyak pohon = 33 pohon
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