A glass aquarium without a cover has the shape of a cube with sides 4 decimeters long. At least how many square decimeters of glass is needed to make this fish tank.
一个无盖玻璃鱼缸的形状是正方体，棱长4分米．制作这个鱼缸时至少需要玻璃多少平方分米．
<gadget id="calculator">4 * 4 * 5</gadget>
<output>80</output>

<result>80</result>