A cube ink tank, its edge length is 6.5cm, how many square centimeters of cardboard is needed to make this ink tank?
一个正方体墨水盒，它的棱长是6.5cm，制作这个墨水盒至少需要多少平方厘米的纸板？
<gadget id="calculator">6.5 * 6.5 * 6</gadget>
<output>253.5</output>

<result>253.5</result>