Naughty uses a 62.8 decimeter long iron wire to make 10 circles of the same size. What is the area of a circle in square decimeters?
淘气用一根长62.8分米的铁丝，做成了10个大小相同同的圆，1个圆的面积是多少平方分米．
<gadget id="calculator">62.8 / 10 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<result>3.14</result>