A cylindrical glass container has a base diameter of 10 cm. After Xiao Ming took a piece of iron out of the water in the container, the water level dropped 3 cm. What is the volume of this block of iron?
一个圆柱形玻璃容器的底面直径是10厘米．小明把一块铁块从这个容器的水中取出后，水面下降3厘米．这块铁块的体积是多少？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 3</gadget>
<output>235.5</output>

<result>235.5</result>