The diameter of a bicycle wheel is about 80 cm. If it turns 100 times per minute, how many meters can it advance per minute?
一辆自行车车轮直径约80CM，如果每分钟转100圈，每分钟可前进多少米？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3.14 * (4/5) * 100</gadget>
<output>251.2</output>

<result>251.2</result>