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80 cm = 2 x (p+15 cm )
80 cm = 2p + 30 cm
2p = 80 cm - 30 cm
2p = 50
P = 50 : 2
= 25 cm
L=15
P=?
menghitung panjang persegi panjang:
80:4=20
20-15=5
Maaf kalo salah ya:) ><
Semoga membantu ya