There is a cylindrical glass with a base diameter of 2 decimeters filled with some water. It is known that the water surface in the glass is 3 cm away from the mouth of the glass. If a cylindrical cone-shaped plumb weight is completely immersed in the water, the water will overflow 30 ml. Find the lead The volume of the hammer.
有一个底面直径是2分米的装有一些水的圆柱形玻璃杯，已知杯中水面距杯口3厘米，若将一个圆柱锥形铅锤完全侵入水中，水会溢出30毫升，求铅锤的体积．
<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 3</gadget>
<output>942</output>

<gadget id="calculator">942 + 30</gadget>
<output>972</output>

<result>972</result>