The park needs to build a cylindrical fountain with a diameter of 4 meters and a depth of 2 meters. A layer of cement is applied to the inner wall and bottom of the pool. What is the area of the cemented part?
公园要修一个直径是4米，深是2米的圆柱形喷水池，在水池的内壁和底层抹一层水泥，抹水泥部分的面积是多少平方米？
<gadget id="calculator">3.14 * 4 * 2</gadget>
<output>25.12</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">25.12 + 12.56</gadget>
<output>37.68</output>

<result>37.68</result>