If a cylinder with a base radius of 5 decimeters and a height of 1 meter is immersed in a rectangular pool with a length of 5 meters and a width of 2 meters, how many decimeters will the water level rise?
把一个底面半径是5分米，高1米圆柱浸没在长5米，宽2米的长方形水池中，水面会上升多少分米？
<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) ** 2</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">3.14 * (1/4) * (1/10) * 10</gadget>
<output>0.785</output>

<result>0.785</result>