The side view of a cylinder is a square. The diameter of the base of the cylinder is 6 cm. What is its height in cm?
一个圆柱的侧面展开图是一个正方形，这个圆柱的底面直径是6厘米，它的高是多少厘米．
<gadget id="calculator">3.14 * 6</gadget>
<output>18.84</output>

<result>18.84</result>