A cylindrical pool has a circumference of 18.84 meters measured from the inside and a depth of 40 decimeters. If a layer of cement is applied in the pool and 8 kg of cement is used per square meter, how many kg of cement is needed?
一个圆柱形水池，从里面量得周长是18.84米，深40分米．如果在池内抹一层水泥，每平方米用水泥8千克，需要水泥多少千克？
<gadget id="calculator">40 / 10</gadget>
<output>4</output>

<gadget id="calculator">18.84 * 4</gadget>
<output>75.36</output>

<gadget id="calculator">18.84 / 3.14 / 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">75.36 + 28.26</gadget>
<output>103.62</output>

<gadget id="calculator">103.62 * 8</gadget>
<output>828.96</output>

<result>828.96</result>