The lateral expansion of a cylinder is a square. The diameter of the base of the cylinder is 5 cm. What is the height of the cylinder in cm?
一个圆柱体的侧面展开是一个正方形，这个圆柱体的底面直径是5厘米，这个圆柱体的高是多少厘米．
<gadget id="calculator">3.14 * 5</gadget>
<output>15.7</output>

<result>15.7</result>