A cylinder-shaped reservoir has a base diameter of 6 meters and a height of 30 decimeters measured from the inside. There is water 2.5 meters deep in the reservoir. How many cubic meters of water is there in the reservoir?
一个圆柱体形状的蓄水池，从里面量得底面直径6米，高30分米，池内蓄有2.5米深的水，蓄水池内有水多少立方米．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

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

<gadget id="calculator">3.14 * 9 * 2.5</gadget>
<output>70.65</output>

<result>70.65</result>