Build a cylindrical biogas digester with a bottom diameter of 3m and a depth of 2m. Put cement on the inner wall and lower bottom of the pool, how many square meters is the area where the cement is applied?
修建一个圆柱形的沼气池，底面直径是3m，深2m．在池的内壁与下底面抹上水泥，抹水泥部分的面积是多少平方米？
<gadget id="calculator">3.14 * 3 * 2</gadget>
<output>18.84</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) ** 2</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">3.14 * (9/4)</gadget>
<output>7.065</output>

<gadget id="calculator">18.84 + 7.065</gadget>
<output>25.905</output>

<result>25.905</result>