The radius of the base of a cylinder is 4 cm, the lateral area is 125.6 cm2, what is the height?
一个圆柱体的底面半径是4厘米，侧面积是125.6平方厘米，高是多少．
<gadget id="calculator">2 * 3.14 * 4</gadget>
<output>25.12</output>

<gadget id="calculator">125.6 / 25.12</gadget>
<output>5</output>

<result>5</result>