Uncle Zhang made a glass goldfish tank without a cover with a side length of 4 decimeters. What is the minimum area of glass needed for this goldfish tank?
张叔叔做一个棱长为4分米的无盖玻璃金鱼缸，这个金鱼缸至少需要多大面积的玻璃？
<gadget id="calculator">4 * 4 * 5</gadget>
<output>80</output>

<result>80</result>