Uncle Wang wants to add glass to a square tabletop with a side length of 12 decimeters. How much glass does it need?
王叔叔要给一个边长是12分米的正方形桌面配上玻璃，需要配多大面积的玻璃？
<gadget id="calculator">12 * 12</gadget>
<output>144</output>

<result>144</result>