A bundle of wires is wound 10 times, each with a diameter of 28 cm. How long is the bundle of wires in meters?
一捆电线绕了10圈，每圈直径都是28厘米，这捆电线长多少米？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">3.14 * 28 * (1/10)</gadget>
<output>8.792</output>

<result>8.792</result>