4a)Tính diện tích xung quanh hình lập phương, biết độ dài cạnh là 1,5 m. b) Một hình lập phương làm bằng bìa không có nắp, độ dài cạnh là 3,2 dm. Tính diện tích bìa làm hình đó ? …………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….......................... Câu 5: Một cái hộp hình lập phương có diện tích toàn phần là 216 cm2. Tính diện tích xung quanh cái hộp đó ? ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

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