Xiaojun’s family planted a square vegetable garden with a side length of 12 meters last year. In order to increase income, his family increased the side length of this square vegetable garden by 4 meters this year. How much has the area of the vegetable garden increased?
小军家去年种植了一块边长为12米的正方形菜园，为增加收入，今年他家把这块正方形菜园的边长都增加了4米，这块菜园的面积增加了多少？
<gadget id="calculator">4 + 12</gadget>
<output>16</output>

<gadget id="calculator">16 * 16</gadget>
<output>256</output>

<gadget id="calculator">12 * 12</gadget>
<output>144</output>

<gadget id="calculator">256 - 144</gadget>
<output>112</output>

<result>112</result>