The inner diameter of a beverage bottle is 7cm, and the height of the beverage is 8cm. When the bottle cap is tightened and placed upside down, the height of the part without beverage is 15cm. What is the volume of this drink bottle?
一个饮料瓶的内直径是7cm，饮料的高度是8cm，把瓶盖拧紧后倒置放平，无饮料部分的高度是15cm．这个饮料瓶的容积是多少？
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">(7/2) ** 2</gadget>
<output>49/4 = around 12.25</output>

<gadget id="calculator">3.14 * (49/4) * 15</gadget>
<output>576.975</output>

<gadget id="calculator">3.14 * (49/4) * 8</gadget>
<output>307.72</output>

<gadget id="calculator">576.975 + 307.72</gadget>
<output>884.695</output>

<result>884.695</result>