cylinder is a square whose base is 3 cm in diameter and what is its height in cm.
一个圆柱的侧面展开是正方形，它的底面直径3厘米，它的高是多少厘米．
<gadget id="calculator">3.14 * 3</gadget>
<output>9.42</output>

<result>9.42</result>