The circumference of a circle is 43.96 decimeters, what is its area in square decimeters?
圆的周长是43.96分米，它的面积是多少平方分米．
<gadget id="calculator">43.96 / 3.14 / 2</gadget>
<output>7</output>

<gadget id="calculator">7 ** 2</gadget>
<output>49</output>

<gadget id="calculator">3.14 * 49</gadget>
<output>153.86</output>

<result>153.86</result>