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= 4(50)
= 200 m
banyaknya pohon = 200 / 10
= 20 pohon
panjang sisi = 50 m
jarak antar pohon = 10 m
maka :
K = 4 x sisi
= 4 x 50
= 200 m
jadi jumlha pohn y dibuthkn = 200/10 = 20 buah