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→ 70.650 = 3,14 × r²
→ r² = 22.500
→ r = 150 m
a. diameter = 2r = 300 m
b. keliling = phi × d = 3,14 × 300 m = 942 m
c. Banyak pohon = (942/6) + 1 = 158 pohon