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keliling persegi = 4s
keliling persegi panjang = 2p + 2l
keliling persegi = 4 x 12 = 48 cm
keliling persegi panjang
48 = 2p + 2 x 6
48 = 2p + 12
48 - 12 = 2p
36 = 2p
p = 36/2
p = 18
berarti panjangnya adalah 18 cm