How much does it cost to build a cylindrical biogas digester with a bottom diameter of 3m and a depth of 2m, and put cement on the four walls and the bottom of the pond. The cement is 180 yuan per square meter?
修建一个圆柱形的沼气池，底面直径3m，深2m，在池的四壁与下底面抹上水泥，每平方米水泥180元，共需花多少钱？
<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>

<gadget id="calculator">25.905 * 180</gadget>
<output>4_662.9</output>

<result>4_662.9</result>