A bundle of wires is wound 30 times around a cylinder with a radius of 0.1 m. How many meters is the bundle of wires approximately?
一捆电线在半径为0.1米的圆筒上绕了30圈，这捆电线大约长多少米？
<gadget id="calculator">3.14 * 0.1 * 2 * 30</gadget>
<output>18.84</output>

<result>18.84</result>