The length of the hour hand of a clock is 5 cm. From 6:00 to 8:24, what is the area swept by the hour hand?
一个时钟时针长5cm，它从6点到8点24分，时针扫过的面积是多少？
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">3.14 * 25 * (1/12) * 2.4</gadget>
<output>15.7</output>

<result>15.7</result>