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Keliling = 84 m
Lebar = 18 m
Maka,
84 = 2 × (p+18)
84 = 2p + 36
84 - 36 = 2p
48 = 2p
24 = p
Jadi, panjang kolam renang yaitu 24 cm
P=k÷2-p
=84÷2-18
=42-18
=24 m
Pembuktian:
K=2×(p+l)
=2×(24+18)
=2×42
=84 m