The minute hand of a clock is 9 cm long. From 2 o'clock to 5 o'clock, what is the area covered by the minute hand in cm**2.
一个钟表的分针长9cm，从2时走到5时，分针走过了的面积是多少cm**2．
<gadget id="calculator">9 ** 2</gadget>
<output>81</output>

<gadget id="calculator">3.14 * 81 * 3</gadget>
<output>763.02</output>

<result>763.02</result>