The circumference of a circle is 62.8cm. After the radius is reduced by 1cm, what is the area in cm**2.
一个圆的周长是62.8cm，半径减少1cm后，面积是多少cm**2．
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">62.8 / 6.28</gadget>
<output>10</output>

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

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

<gadget id="calculator">3.14 * 81</gadget>
<output>254.34</output>

<result>254.34</result>