To measure the volume of an irregular stone, fill a cylindrical bucket with water at a height of 20 cm. When the stone is placed in the water, the water level rises to 28 cm. The measured circumference of the bottom of the bucket is 69.08 cm. What is the volume of this stone?
为了测定一块不规则石头的体积，在圆柱形水桶里，装水面高度为20厘米的水．把石头放入水中，水面上升到28厘米．测得水桶的底面周长是69.08厘米，这块石头的体积是多少？
<gadget id="calculator">69.08 / 3.14 / 2</gadget>
<output>11</output>

<gadget id="calculator">11 ** 2</gadget>
<output>121</output>

<gadget id="calculator">28 - 20</gadget>
<output>8</output>

<gadget id="calculator">3.14 * 121 * 8</gadget>
<output>3_039.52</output>

<result>3_039.52</result>