The circumference of a circular playground is 62.8 meters. Later, the radius is reduced by 1 meter. How many square meters is the area reduced?
一个圆形游乐场的周长是62.8米，后来半径减少1米，面积减少了多少平方米？
<gadget id="calculator">62.8 / 3.14 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">9 ** 2</gadget>
<output>81</output>

<gadget id="calculator">100 - 81</gadget>
<output>19</output>

<gadget id="calculator">3.14 * 19</gadget>
<output>59.66</output>

<result>59.66</result>