If the height of a cylinder increases by 1 cm, its lateral area increases by 25.12 square centimeters. What is the radius of the base of this cylinder?
一个圆柱它的高增加1厘米，它的侧面积就增加25.12平方厘米，这个圆柱的底面半径是多少？
<gadget id="calculator">25.12 / 1 / 3.14 / 2</gadget>
<output>4</output>

<result>4</result>