The volume of a cylinder is 15.7 cubic decimeters, the radius of the base is 1 decimeter, and the height is how many decimeters.
一个圆柱的体积是15.7立方分米，底面半径是1分米，高是多少分米．
<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<gadget id="calculator">15.7 / 3.14</gadget>
<output>5</output>

<result>5</result>