A piece of iron wire is 15.7 meters long, and exactly 100 iron rings of the same size are made. What is the radius of each iron ring in centimeters?
一根铁丝长15.7米，正好制成100个同样大小的铁环，每个铁环的半径是多少厘米？
<gadget id="calculator">15.7 / 100</gadget>
<output>0.157</output>

<gadget id="calculator">100 / 3.14 / 2</gadget>
<output>15.923567</output>

<gadget id="calculator">0.157 * 15.923567</gadget>
<output>2.5</output>

<result>2.5</result>