An acrobat performs a tightrope walk on a unicycle. The diameter of the wheel is 30cm. To ride a steel wire 18.84m long, how many revolutions does the wheel have to make?
杂技演员表演独轮车走钢丝，车轮直径为30cm，要骑过18.84m长的钢丝，车轮要转多少周？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">3.14 * (3/10)</gadget>
<output>0.942</output>

<gadget id="calculator">18.84 / 0.942</gadget>
<output>20</output>

<result>20</result>