To make a cube glass goldfish tank without a cover, its edge length is 4dm, how much glass is needed to make this fish tank?
做一个无盖的正方体玻璃金鱼缸，它的棱长是4dm，做这个鱼缸至少需要多少玻璃？
<gadget id="calculator">4 * 4 * 5</gadget>
<output>80</output>

<result>80</result>