A cylindrical swimming pool has a bottom diameter of 10 meters and a height of 4 meters. Apply cement around it and at the bottom, 5 square meters per kilogram of cement, how many kilograms of cement are needed in total?
一个圆柱型的游泳池，底面直径是10米，高是4米．在它的四周和底部涂水泥，每千克水泥可涂5平方米，共需多少千克水泥？
<gadget id="calculator">3.14 * 10 * 4</gadget>
<output>125.6</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<gadget id="calculator">125.6 + 78.5</gadget>
<output>204.1</output>

<gadget id="calculator">204.1 / 5</gadget>
<output>40.82</output>

<result>40.82</result>