There is a circular children's playground in the park. Its circumference is 81.64 meters. Later, when it was expanded, its radius was increased by 2 meters. After the expansion, how many square meters has the area of the playground increased?
公园里有一个圆形儿童游乐场，其周长为81.64米，后来扩建时将它的半径增加了2米，扩建后，这个游乐场的面积增加了多少平方米？
<gadget id="calculator">81.64 / 3.14 / 2</gadget>
<output>13</output>

<gadget id="calculator">13 + 2</gadget>
<output>15</output>

<gadget id="calculator">15 ** 2</gadget>
<output>225</output>

<gadget id="calculator">13 ** 2</gadget>
<output>169</output>

<gadget id="calculator">225 - 169</gadget>
<output>56</output>

<gadget id="calculator">3.14 * 56</gadget>
<output>175.84</output>

<result>175.84</result>