The diameter of a bicycle wheel is 0.5 meters, the pedal gear has 48 teeth, and the rear gear has 16 teeth. How many meters does the bicycle travel in one circle?
一辆自行车车轮直径是0.5米，脚踏板齿轮有48个齿，后齿轮有16个齿，脚踏一圈，自行车前进多少米．
<gadget id="calculator">0.5 * 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<gadget id="calculator">48 / 16</gadget>
<output>3</output>

<gadget id="calculator">3.14 * 3</gadget>
<output>9.42</output>

<result>9.42</result>