The circumference of a CD is 37.68 cm, what is its area in square centimeters?
一张CD碟片的周长是37.68厘米，它的面积是多少平方厘米．
<gadget id="calculator">37.68 / 3.14 / 2</gadget>
<output>6</output>

<gadget id="calculator">3.14 * 6 * 6</gadget>
<output>113.04</output>

<result>113.04</result>