Expand the sides of a cylinder to obtain a square. If the diameter of the base of the cylinder is 2 decimeters, 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．如果这个圆柱体的底面直径是2分米，那么这个圆柱体的高是多少分米．
<gadget id="calculator">2 * 3.14 * 2</gadget>
<output>12.56</output>

<result>12.56</result>