There is a cylindrical object in a cylindrical glass tank with a bottom diameter of 20 cm. The cylinder (2/3) is submerged in water. When the cylinder is taken out, the water level in the tank drops by 2 cm. Find the volume of the cylinder.
一个底面直径20厘米的圆柱形玻璃缸里有一个圆柱体物品，圆柱的(2/3)浸没在水中，把这个圆柱体拿出来，缸内水面下降了2厘米，求这个圆柱体的体积．
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

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

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">2 / (2/3)</gadget>
<output>3</output>

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

<result>942</result>