The shape of a glass fish tank without a cover is a cube, and the side length is 3 decimeters. What is the minimum area of glass needed to make this fish tank?
一个无盖玻璃鱼缸的形状是正方体，棱长是3分米，制作这个鱼缸至少需要多大面积的玻璃？
<gadget id="calculator">3 * 3 * 5</gadget>
<output>45</output>

<result>45</result>