The diameter of a wheel is 70 cm, how many meters does the wheel move in one rotation?
一个车轮的直径是70厘米，车轮转动一周大约前进多少米．
<gadget id="calculator">3.14 * 70</gadget>
<output>219.8</output>

<gadget id="calculator">219.8 / 100</gadget>
<output>2.198</output>

<result>2.198</result>