Put a cylindrical iron block with a bottom area of 10 square centimeters and a height of 3.14 cm into a cylindrical bucket with a bottom radius of 5 cm. The water completely submerges the iron block without overflowing. How many cm does the water level rise?
把一个底面积是10平方厘米，高是3.14cm的圆柱形铁块，放入一个底面半径为5cm的圆柱形水桶内，水完全浸没铁块，且没有溢出，水面上升了多少cm？
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

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

<gadget id="calculator">3.14 / 78.5</gadget>
<output>0.04</output>

<gadget id="calculator">10 * 0.04</gadget>
<output>0.4</output>

<result>0.4</result>