Expand the sides of a cylinder to get a square. The radius of the base of the cylinder is 1dm. What is the height of the cylinder?
把一个圆柱体的侧面展开得到一个正方形，这个圆柱体的底面半径是1dm，这个圆柱体的高是多少？
<gadget id="calculator">2 * 3.14 * 1</gadget>
<output>6.28</output>

<result>6.28</result>