A cylindrical steel column with a base radius of 5 cm and a height of 2 decimeters is cast into a cone with a base diameter of 4 decimeters. How many centimeters is the height of the cone?
把一个底面半径为5厘米，高2分米的圆柱形钢柱熔铸成一个底面直径为4分米的圆锥，这个圆锥的高是多少厘米？
<gadget id="calculator">3.14 * 400</gadget>
<output>1_256</output>

<gadget id="calculator">3_000 / 1_256</gadget>
<output>375/157 = around 2.388535</output>

<gadget id="calculator">3.14 * (375/157)</gadget>
<output>7.5</output>

<result>7.5</result>