The minute hand of a wall clock is 5 cm long. What is the area swept by the minute hand from 1 o'clock to 5 o'clock?
一个挂钟分针长5厘米，当时针从1时走到5时，分针扫过的面积是多少平方厘米．
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 4</gadget>
<output>314</output>

<result>314</result>