If the circumference of the base of a cylinder is 12.56 decimeters and the height is 3 decimeters, what is its volume in cubic decimeters?
一个圆柱体底面周长是12.56分米，高是3分米，它的体积是多少立方分米．
<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 * 3</gadget>
<output>37.68</output>

<result>37.68</result>