The minute hand of a wall clock is 5 cm long and the hour hand is 4 cm long. From 6 o'clock to 18 o'clock, what is the area swept by the hour hand in square centimeters?
一个挂钟分针长5厘米，时针长4厘米，从6时走到18时，时针扫过的面积是平方厘米？
<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<result>50.24</result>