Draw a circle with a circumference of 25.12 centimeters, how many centimeters should the legs of the compass be spread apart?
画一个周长25.12厘米的圆，圆规两脚应张开多少厘米．
<gadget id="calculator">25.12 / 3.14 / 2</gadget>
<output>4</output>

<result>4</result>