A circular ornamental fish pond has a circumference of 251.2 meters. What is the radius of this fish pond in meters?
一个圆形观赏鱼池，周长是251.2米，这个鱼池的半径有多少米．
<gadget id="calculator">251.2 / 3.14 / 2</gadget>
<output>40</output>

<result>40</result>