The diameter of a wheel is 100 cm, how many meters does the wheel travel in one rotation?
一个车轮的直径是100厘米，车轮转动一周前进多少米．
<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<gadget id="calculator">314 / 100</gadget>
<output>157/50 = around 3.14</output>

<result>157/50 = around 3.14</result>