The height of the reservoir is 2.25 meters, the diameter of the bottom surface is 4.5 meters, and the thickness is 0.25 meters. The thickness of the bottom of the reservoir is the same as that of the wall. How many cubic meters of cement are needed to build the reservoir?
蓄水池高2.25米，底面直径是4.5米，厚度0.25米，水池底的厚度与壁的厚度相同，建这个水池需要用水泥多少立方米？
<gadget id="calculator">4.5 / 2</gadget>
<output>2.25</output>

<gadget id="calculator">2.25 ** 2</gadget>
<output>5.0625</output>

<gadget id="calculator">3.14 * 5.0625 * 2.25</gadget>
<output>35.766562</output>

<gadget id="calculator">2.25 - 0.25</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4 * 2</gadget>
<output>25.12</output>

<gadget id="calculator">35.766562 - 25.12</gadget>
<output>10.646562</output>

<result>10.646562</result>