A cylindrical pool has a bottom diameter of 4 meters and a depth of 1.5 meters. To smear cement on the bottom surface and inner wall, use 2.5 kilograms of cement per square meter, how many kilograms of cement are needed in total?
一个圆柱形水池，底面直径是4米，池深1.5米．要在底面和内壁抹上水泥，每平方米用水泥2.5千克，共需水泥多少千克？
<gadget id="calculator">3.14 * 4 * 1.5</gadget>
<output>18.84</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">18.84 + 12.56</gadget>
<output>31.4</output>

<gadget id="calculator">31.4 * 2.5</gadget>
<output>78.5</output>

<result>78.5</result>