An acrobat performs a single-wheel tightrope walk. The diameter of the wheel is 50 centimeters. To ride a 62.8-meter-long steel wire, how many times does the wheel turn?
杂技演员表演独轮走钢丝，车轮直径为50厘米，要骑地62.8米长的钢丝，车轮要转动多少圈？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3.14 * (1/2)</gadget>
<output>1.57</output>

<gadget id="calculator">62.8 / 1.57</gadget>
<output>40</output>

<result>40</result>