cylindrical piece of wood has a base circumference of 6.28 decimeters and a length of 1 meter. What is the volume of this piece of wood?
一根圆柱形木料，底面周长是6.28分米，长是1米．这根木料的体积是多少？
<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 * 1 * 10</gadget>
<output>31.4</output>

<result>31.4</result>