Dig a cylindrical reservoir with a volume of 141.3 cubic meters and an inner diameter of the bottom of the pond with a diameter of 10 meters. How deep should it be dug?
挖一个容积为141.3立方米的圆柱形蓄水池，池底内直径10米，应该挖多深？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<gadget id="calculator">141.3 / 78.5</gadget>
<output>1.8</output>

<result>1.8</result>