A cylinder has a base circumference of 25.12 decimeters and a height of 4 decimeters, what is its volume in cubic decimeters?
一个圆柱的底面周长是25.12分米，高4分米，它的体积是多少立方分米．
<gadget id="calculator">25.12 / 3.14 / 2</gadget>
<output>4</output>

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

<gadget id="calculator">3.14 * 16 * 4</gadget>
<output>200.96</output>

<result>200.96</result>