cylindrical side view is a square, its base diameter is 2 decimeters, what is the height of the cylinder in decimeters.
一个圆柱侧面展开图是正方形，它的底面直径是2分米，圆柱的高是多少分米．
<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<result>6.28</result>