A cylindrical pool has a bottom diameter of 20 meters and a depth of 3 meters. The sides and bottom of the pool are plastered with cement. What is the area of the cemented part?
一个圆柱形水池，底面直径是20米，深是3米，在水池的侧面和底面抹上水泥，抹水泥部分的面积是多少？
<gadget id="calculator">3.14 * 20 * 3</gadget>
<output>188.4</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<gadget id="calculator">188.4 + 314</gadget>
<output>502.4</output>

<result>502.4</result>