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=2(10+15)
=2(25)
= 50 m
jumlah pohon = k÷jarak antar pohon
= 50 m ÷ 50cm
= 5000 ÷ 50
= 100 pohon
10 m = 1000 cm : 50 cm = 20
Terus itung dengan rumus keliling persegi panjang
30+20+30+20 = 100