A cylinder has a base circumference of 6.28 decimeters and a height of 1 decimeter. What is the volume?
一个圆柱的底面周长为6.28分米，高是1分米．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</gadget>
<output>3.14</output>

<result>3.14</result>