If the circumference of a circle is 12.56 decimeters, what is its area in square centimeters?
一个圆的周长是12.56分米，它的面积是多少平方厘米．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">12.56 * 100</gadget>
<output>1_256</output>

<result>1_256</result>