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PQ = √(12² + 9²) = √(144+81) = √225 = 15 cm
no. 4
keliling persegi = keliling persegi pnjng = 48 cm
48 cm = 2 × (pnjng + lebar)
48 cm = 2 × ( p + 6 cm )
48 cm = 2p + 12 cm
2p = 48 cm - 12 cm
2p = 36 cm
p = 36/2 cm = 18 cm
kalo no. 5 maaf saya kurng paham soalnya de :)