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K = 2 X phi X r
= 2 X 22/7 X 21
= 132m
banyak pohon yang ditanam = 132 / 3
= 44 pohon
Kll = 22/7 x 42
Kll = 132 meter
Jumlah pohon = kelling/jarak
Jumlah pohon =132/3
Jumlah pohon = 44 pohon
Jadi, banyaknya pohon yang ditanam pak Hasan adalah 44 buah
Ok?