The minute hand of a clock is 20 cm long. What is the distance traveled by the tip of the minute hand in 30 minutes? (π takes 3.14)
一只挂钟的分针长20厘米，经过30分钟，分针的尖端所走过的路程是多少厘米．(π取3.14)
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 20 * 1</gadget>
<output>62.8</output>

<result>62.8</result>