There is a cylindrical bucket with a bottom diameter of 6 cm and a height of 6 cm, and the depth of water in the bucket is 4 cm. A block of iron is placed in water and submerged completely until the water rises to 5 cm. How big is this block of iron?
有一个底面直径是6厘米，高是6厘米的圆柱形水桶，桶里水深4厘米．把一块铁块放入水中，完全浸没，水上升到5厘米．这块铁块的体积有多大？
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 9 * 1</gadget>
<output>28.26</output>

<result>28.26</result>