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Pertama kita cari dulu jari-jarinyaL = Π r²
154 = 22/7 r²
154 × 7/22 = r²
r² = 154 × 7/22
r² = 1078/22
r² = 49
r =√49
r = 7 m
Lalu kita mencari keliling lingkaran
K = 2 Π r
= 2 × 22/7 × 7
= 2 × 22
= 44 m
maka banyak pohon yang ditanam adalah
44 m : 0,5 m = 88 pohon
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