How many square decimeters of glass are needed to make a cubic glass fish tank without a cover whose edge length is 12 decimeters?
制作一个棱长是12分米的无盖正方体玻璃鱼缸，需要多少平方分米的玻璃．
<gadget id="calculator">12 * 12 * 5</gadget>
<output>720</output>

<result>720</result>