A cylinder of wood has a circumference of 12.56 decimeters and a height of 4.5 decimeters. What is the volume of this wood?
一根圆柱体木料，底面周长是12.56分米，高是4.5分米，求这根木料的体积？
<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4 * 4.5</gadget>
<output>56.52</output>

<result>56.52</result>