A cylindrical flower pond has a base radius of 5 meters measured from the inside and a depth of 0.5 meters. If this flower pond is filled with soil, how many cubic meters of soil are needed?
一个圆柱形状的花池，从里面量底面半径5米，深0.5米．如果在这个花池里填满土，共需要多少立方米的土？
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 0.5</gadget>
<output>39.25</output>

<result>39.25</result>