There is a square pool with an area of 36 square meters in Harmony Home Community. In order to beautify the environment, the community property expanded the side length of this square pool to twice the original size. What is the area of this square pool after reconstruction?
和谐家园小区有一个面积是36平方米的正方形水池，小区物业为了美化环境将这个正方形水池的边长扩大到原来的2倍，改建后这个正方形水池的面积是多少平方米？
<gadget id="calculator">6 * 2</gadget>
<output>12</output>

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

<result>144</result>