A cube-shaped goldfish tank (with no cover on top), with a side length of 4 decimeters, how many square meters of glass is needed to make such a fish tank?
一只正方体形状的金鱼缸(上面没有盖)，棱长4分米，做这样一只鱼缸需要多少平方米的玻璃？
<gadget id="calculator">4 * 4 * 5</gadget>
<output>80</output>

<result>80</result>