A cylindrical milk powder box has a bottom diameter of 5 cm and a height of 20 cm. What is its volume in cubic centimeters?
一个圆柱形奶粉盒的底面直径是5厘米，高是20厘米，它的容积是多少立方厘米？
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) ** 2</gadget>
<output>25/4 = around 6.25</output>

<gadget id="calculator">3.14 * (25/4) * 20</gadget>
<output>392.5</output>

<result>392.5</result>