Mr. Zhang wound a CD with a wire for one week. The length of the measured wire is 31.4 decimeters. What is the diameter of this CD in centimeters?
张老师用线绕一张光盘一周，量的线长31.4分米，这张光盘的直径是多少厘米．
<gadget id="calculator">31.4 / 3.14</gadget>
<output>10</output>

<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<result>100</result>