There is a kind of beverage bottle, the circumference of its bottom surface is 25.12cm, and there are some beverages in the beverage bottle. When the beverage bottle is placed upright, the height of the beverage in the bottle is 21cm. When it is inverted, the height of the empty part is 4cm. The height of the beverage bottle What is the volume?
有一种饮料瓶，它的底面周长是25.12cm，饮料瓶中装着一些饮料，把这个饮料瓶正放时，瓶中饮料高度21cm，倒放时，空余部分的高度是4cm，这个饮料瓶的容积是多少？
<gadget id="calculator">25.12 / 3.14 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">21 + 4</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 16 * 25</gadget>
<output>1_256</output>

<result>1_256</result>