A cylindrical container has a bottom diameter of 20 cm measured from the inside and a water surface height of 12 cm. Put a conical billet (immersed in water) in the container, at this moment the water level rises to 15cm, so what is the volume of this conical billet?
一个圆柱体容器，从里面量底面直径是20cm，水面高度是12cm．在容器内放入一个圆锥体钢坯(浸入水中)，这时水面高度上升至15cm，那么这个圆锥体钢坯的体积是多少？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

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

<gadget id="calculator">15 - 12</gadget>
<output>3</output>

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

<result>942</result>