The diameter of a wheel is 67 cm, how many meters does the wheel move in one rotation?
一个车轮的直径是67厘米，车轮转动一周大约前进多少米．
<gadget id="calculator">3.14 * 67</gadget>
<output>210.38</output>

<gadget id="calculator">210.38 / 100</gadget>
<output>2.1038</output>

<result>2.1038</result>