[tex]keliling \: bangun = 12 + 25 + 5 + 12 + (25 - 5) \\ = 12 + 25 + 5 + 12 + 20 \\ = 74 \: cm[/tex]
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[tex]keliling \: bangun = 12 + 25 + 5 + 12 + (25 - 5) \\ = 12 + 25 + 5 + 12 + 20 \\ = 74 \: cm[/tex]