steel wire is 20 meters long, and 1.16 meters remain after winding 100 times on a cylindrical coil. What is the radius of the cross section of the coil in centimeters?
一根钢丝长20米，在一个圆柱形线圈上绕了100周后还余1.16米，这个线圈的横截面半径是多少厘米﹖
<gadget id="calculator">20 - 1.16</gadget>
<output>18.84</output>

<gadget id="calculator">100 / 100 / 3.14 / 2</gadget>
<output>0.159236</output>

<gadget id="calculator">18.84 * 0.159236</gadget>
<output>3.000006</output>

<result>3.000006</result>