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1386 = 22/7 r²
22/7 r² = 1386
r² = 1386 × 7/22
r = √441 = 21m
k.lingkaran = π.diameter
= 22/7× (2.42)
= 132m
bnyak pohon yg dpt ditanam dengan jarak 4m / pohon :
132 / 4 = 33pohon
jd jwbnnya = C