A cylindrical pool has a bottom diameter of 6m and a pool depth of 2m. It is necessary to plaster the bottom and inner walls of the pool with cement. The amount of cement used per square meter is 3.5 kg. How many kg of cement is needed in total?
一个圆柱形水池，底面直径是6m，池深2m，要在水池的底面和内壁抹上水泥，每平方米用水泥3.5千克，共需要水泥多少千克？
<gadget id="calculator">3.14 * 3 * 2</gadget>
<output>18.84</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<gadget id="calculator">18.84 + 28.26</gadget>
<output>47.1</output>

<gadget id="calculator">3.5 * 47.1</gadget>
<output>164.85</output>

<result>164.85</result>