Draw a circle with a circumference of 25.12 cm. What is the distance between the two corners of the compass in cm?
画一个周长是25.12厘米的圆，圆规两角张开的距离是多少厘米．
<gadget id="calculator">25.12 / 3.14 / 2</gadget>
<output>4</output>

<result>4</result>