The construction site master needs to use cement to build sewers, the inner radius is 0.5 meters, the outer radius is 0.6 meters, and the length of one sewer is 1.5 meters. How many cubic meters of cement is needed to make 100 such sewers?
工地师傅要用水泥造下水道，内圆半径0.5米，外圆半径0.6米，一根下水道长1.5米，做这样的下水道100根，需用水泥多少立方米？
<gadget id="calculator">0.6 ** 2</gadget>
<output>0.36</output>

<gadget id="calculator">0.5 ** 2</gadget>
<output>0.25</output>

<gadget id="calculator">0.36 - 0.25</gadget>
<output>0.11</output>

<gadget id="calculator">3.14 * 0.11 * 100</gadget>
<output>34.54</output>

<result>34.54</result>