Dig a cylindrical reservoir whose bottom diameter is 3m and depth is 2.5m. Put cement on the bottom surface and inner wall of the pool, and use 2.4kg of cement per square meter. How many kilograms of cement are needed in total?
挖一个圆柱形的蓄水池，已知它的底面直径是3m，池深2.5m．在水池的底面和内壁抹上水泥，每平方米用水泥2.4kg，共需水泥多少千克？
<gadget id="calculator">3.14 * 3 * 2.5</gadget>
<output>23.55</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) ** 2</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">3.14 * (9/4)</gadget>
<output>7.065</output>

<gadget id="calculator">23.55 + 7.065</gadget>
<output>30.615</output>

<gadget id="calculator">2.4 * 30.615</gadget>
<output>73.476</output>

<result>73.476</result>