A cylinder is 2 meters high and has a base circumference of 12.56 decimeters. What is its volume?
一个圆柱高2米，底面周长12.56分米，它的体积是多少．
<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 * 2 * 10</gadget>
<output>251.2</output>

<result>251.2</result>