The diameter of the bottom of a cylindrical glass is 8 cm. If a piece of iron is submerged in water and the water level rises by 2 cm, what is the volume of the piece of iron?
一个圆柱形玻璃杯的底面直径是8厘米，把一块铁浸没在水中，水面上升了2厘米，这块铁的体积是多少？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 2</gadget>
<output>100.48</output>

<result>100.48</result>