There is a circular garden with a radius of 4 meters. Now it is necessary to expand the garden and increase its radius by 2 meters. How many square meters will the area of the garden increase?
有一个圆形的花园，其半径为4米，现要将花园扩大，将其半径增加2米，这样花园的面积将增加多少平方米？
<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">36 - 16</gadget>
<output>20</output>

<gadget id="calculator">3.14 * 20</gadget>
<output>62.8</output>

<result>62.8</result>