The minute hand of an ancient clock is 15 cm long, what is the area swept by the minute hand from 12 o'clock to 9 o'clock in square centimeters?
一座古钟的分针长15厘米，分针从12点到9点扫过的面积是多少平方厘米．
<gadget id="calculator">15 ** 2</gadget>
<output>225</output>

<gadget id="calculator">3.14 * 225 * 9</gadget>
<output>6_358.5</output>

<result>6_358.5</result>