A boiler with a circular bottom has a circumference of 1.57 meters. What is the radius of the base in meters?
一个底面是圆形的锅炉，底面圆的周长是1.57米．底面半径是多少米？
<gadget id="calculator">1.57 / 3.14 / 2</gadget>
<output>0.25</output>

<result>0.25</result>