A square field with an area of 1 hectare increases the length of each side by 120 meters. How many hectares does the area of the field increase?
一个占地1公顷的正方形田地，边长各增加120米，田地的面积增加多少公顷？
<gadget id="calculator">100 + 120</gadget>
<output>220</output>

<gadget id="calculator">220 * 220</gadget>
<output>48_400</output>

<gadget id="calculator">1 * 10_000</gadget>
<output>10_000</output>

<gadget id="calculator">48_400 - 10_000</gadget>
<output>38_400</output>

<gadget id="calculator">38_400 / 10_000</gadget>
<output>96/25 = around 3.84</output>

<result>96/25 = around 3.84</result>