piece of iron wire is 9.42 meters long and is wound 10 times on a circular spool. What is the radius of the spool in decimeters.
一根铁丝长9.42米，正好在一个圆形线轴上绕10周．这个线轴的半径是多少分米．
<gadget id="calculator">9.42 / 10 / 3.14 / 2</gadget>
<output>0.15</output>

<gadget id="calculator">0.15 * 10</gadget>
<output>1.5</output>

<result>1.5</result>