The lateral expansion of a cylinder is a square, the radius of the base of the cylinder is 0.3 decimeters, what is the height of the cylinder in centimeters.
一个圆柱的侧面展开是正方形，圆柱的底面半径是0.3分米，圆柱的高是多少厘米．
<gadget id="calculator">2 * 3.14 * 0.3</gadget>
<output>1.884</output>

<result>1.884</result>