A unicycle has a radius of 20 cm and turns forward 8 times, how many meters does it travel?
一种独轮车的半径是20厘米，向前转动8圈，前进多少米？
<gadget id="calculator">8 / 100</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">2 * 3.14 * 20 * (2/25)</gadget>
<output>10.048</output>

<result>10.048</result>