There is a circular pillar in front of the hotel. Its circumference is 31.4 decimeters. What is the diameter of this pillar?
大酒店门前有一根圆形柱子，量得它的周长是31.4分米，这根柱子的直径是多少分米？
<gadget id="calculator">31.4 / 3.14</gadget>
<output>10</output>

<result>10</result>