Put a conical iron block with a base radius of 5 cm and a height of 9 cm into a cylindrical container filled with water and completely submerge it. The inner diameter of the cylinder is known to be 20 cm. How many centimeters will the water level rise when the iron block is placed in the water?
把一个底面半径5厘米、高9厘米的圆锥铁块放入到装有水的圆柱形容器中，完全浸没．已知圆柱的内直径是20厘米．铁块放入水中，水面会上升几厘米？
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3.14 * 25 * 9 * (1/3)</gadget>
<output>235.5</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<gadget id="calculator">235.5 / 314</gadget>
<output>0.75</output>

<result>0.75</result>