A 20-meter-long iron wire is wound 3 times on a disc, and there is an extra 1.16 meters. What is the radius of the disc in meters?
把一根长20米的铁丝，在一圆盘上绕了3圈，还多1.16米，这个圆盘的半径是多少米
<gadget id="calculator">20 - 1.16</gadget>
<output>18.84</output>

<gadget id="calculator">18.84 / 3 / 3.14 / 2</gadget>
<output>1</output>

<result>1</result>