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L = 15.400
jrk antar pohon = 4 m
maka :
L = π x r²
15.400 = 22/7 x r²
4900 = r²
r = √4900
r = 70 m
K lingkaran = 2 x π x r
= 2 x 22/7 x 70
= 440 m
jadi jumlh pohon = 440 m : 4 = 110 pohon
15400=22/7 x r2
15400 x 7/22=r2
49=r2
70=r
d=140 m
keliling=22/7 x d
=22/7 x 140
=440 m
banyak pohon=440/4=110 buah