The circumference of the base of a cylinder is 6.28 decimeters and the height is 8 decimeters. What is its volume in cubic decimeters?
一个圆柱的底面周长是6.28分米，高是8分米，它的体积是多少立方分米．
<gadget id="calculator">6.28 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 8</gadget>
<output>25.12</output>

<result>25.12</result>