A cylinder of wood has a base circumference of 6.28 decimeters and a height of 10 decimeters. Find the volume of this wood.
一根圆柱体木料，底面周长是6.28分米，高10分米，求这根木料的体积．
<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 * 10</gadget>
<output>31.4</output>

<result>31.4</result>