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L = phi X r²
1386 = 22/7 X r²
r² = 1386.7/22 (sekarang dicari K)
r = √441
= 21m
K = 2 X phi X r
= 2 X 22/7 X 21
= 132m
banyak pohon yang ditanami = 132/4
= 33 pohon
1386 x 7 = 22 x r x r
9702 = 22 x r x r
9702/22 = r x r
441 = r kuadrat
r = akar 441
r = 21 m
K = 2 x 22/7 x 21
= 132 m
banyak pohon = K/jarak pohon
= 132 / 4
= 33 pohon