A batch of circular clock faces produced by a watch factory has a circumference of 15.7 cm and a diameter of 15.7 cm.
某钟表厂生产的一批圆形钟面，它的周长是15.7厘米，直径是多少厘米．
<gadget id="calculator">15.7 / 3.14</gadget>
<output>5</output>

<result>5</result>