A chemical plant needs to build a cylindrical sewage treatment tank with a bottom diameter of 20 meters and a depth of 4 meters. Cement is spread around the sewage treatment tank and on the ground. If 5 kilograms of cement is used per square meter, how many kilograms of cement are needed in total?
化工厂要建一个圆柱形污水处理池，底面直径20米，深4米，在污水处理池的四周和地面都抹上水泥，如果每平方米用水泥5千克，共需水泥多少千克．
<gadget id="calculator">3.14 * 20 * 4</gadget>
<output>251.2</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">251.2 + 314</gadget>
<output>565.2</output>

<gadget id="calculator">565.2 * 5</gadget>
<output>2_826</output>

<result>2_826</result>