For a cylindrical water tank, it is known that the radius of its bottom surface is 2m, and the height of the pool is 3m. The bottom surface and inner wall of the pool are covered with cement, and the amount of cement used is 2 kg per square meter. How many kg of cement is needed in total?
一个圆柱形的蓄水池，已知它的底面半径是2m，池高3m，在水池的底面和内壁抹上水泥，每平方米用水泥2千克，共需水泥多少千克？
<gadget id="calculator">2 * 3.14 * 2 * 3</gadget>
<output>37.68</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">37.68 + 12.56</gadget>
<output>50.24</output>

<gadget id="calculator">2 * 50.24</gadget>
<output>100.48</output>

<result>100.48</result>