The minute hand of a clock is 10 cm long. From 1:00 to 1:30, how many square centimeters does the minute hand sweep?
某钟表的分针长10cm，从1时到1时30分，分针扫过的面积是多少平方厘米？
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3.14 * 100 * (1/2)</gadget>
<output>157</output>

<result>157</result>