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25 x 4 = 100
100 : 5 = 20
banyak pohon = 20
sisi = √20² + 15² (panjang diagonalnya dibagi 2)
= √400 + 225
= √625
= 25 cm
keliling = 4 x s
= 25 x 4
= 100 cm
banyak pohon = 100 : 5
= 20