The inner wall and bottom of a cylindrical pool are plastered with cement. The bottom of the pool has a radius of 4 decimeters and a depth of 15 meters. What is the area of cement plastered in square meters?
圆柱形水池内壁和底面抹上水泥，水池底面半径是4分米，深15米，抹水泥的面积是多少平方米．
<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3.14 * (2/5) * 2 * 15</gadget>
<output>37.68</output>

<gadget id="calculator">(2/5) ** 2</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">3.14 * (4/25)</gadget>
<output>0.5024</output>

<gadget id="calculator">37.68 + 0.5024</gadget>
<output>38.1824</output>

<result>38.1824</result>