Draw a circle with a compass. If the distance between the two feet of the compass is 5 cm, what is the diameter of the circle drawn?
用圆规画一个圆，如果圆规两脚之间的距离是5厘米，画出的这个圆的直径是多少厘米．
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>