How many square decimeters of glass is needed to make a cube glass aquarium (without cover) with a side length of 4 decimeters?
制作一个棱长为4分米的正方体玻璃鱼缸(无盖)，至少需要多少平方分米的玻璃？
<gadget id="calculator">4 * 4 * 5</gadget>
<output>80</output>

<result>80</result>