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34 =2(9+l)
34 =18+2l
34-18=2l
16 =2l
16/2 =l
8cm =l
34 cm² = 9 + l + 9 + l = 18 + l + l
l = 34 - 18 = 16 : 2 = 8
L. Persegi panjang = 2(p+l) = 2(9+8) = 2×17 = 34