In order to save energy and protect the environment, a certain place launched the project of "every family builds a biogas digester". A cylindrical biogas digester with a bottom diameter of 2m and a height of 2.5m was dug out, and a layer of cement was spread around it and the bottom of the pond. area of cement.
某地为节能环保特推出"家家建沼气池"工程，挖出一个底面直径为2m，高为2.5m的圆柱形沼气池，并在它的四周和池底抹上一层水泥，求抹水泥的面积．
<gadget id="calculator">3.14 * 2 * 2.5</gadget>
<output>15.7</output>

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

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<gadget id="calculator">15.7 + 3.14</gadget>
<output>18.84</output>

<result>18.84</result>