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keliling = 4s = 4 (3x+8) = 104
3x+8 = 104/4
3x+8 = 26
3x = 26-8
3x = 18
3x = 18/3
x = 6
panjang sisi = 3x+8 = 3.6 + 8 = 26 cm
Luas = s² = 26² = 676 cm²