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70.650= 3,14 * r^
r^= 70.650 : 3,14
r^= 22500
r=150
d=2xr
d= 2x150
d=300
b. keliling= phi d
= 3,14 * 300
=942
c. banyak pohon yang ditanam= keliling lingkaran : 6
= 942:6
=157
jadi banyak pohon yang ditanamiada 157 pohon