A cylindrical container with a bottom radius of 3 decimeters is filled with water at a depth of 9 cm. After putting an iron block, the water level rises by 1.5 cm. What is the volume of the iron block?
一个圆柱形容器，底面半径是3分米，里面装有深9厘米的水，放入一个铁块后，水面升高了1.5厘米，这个铁块的体积是多少？
<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">30 ** 2</gadget>
<output>900</output>

<gadget id="calculator">3.14 * 900 * 1.5</gadget>
<output>4_239</output>

<result>4_239</result>