For a cylinder, if the radius of the base increases by 5 cm, its lateral area increases by 125.6 cm2. If the circumference of its base increases by 4 cm, how many cm2 does its lateral area increase?
一个圆柱体，底面半径增加5厘米，它的侧面积就增加125.6平方厘米，如果它的底面周长增加4厘米，那么它的侧面积就增加多少平方厘米？
<gadget id="calculator">2 * 5 * 3.14</gadget>
<output>31.4</output>

<gadget id="calculator">125.6 / 31.4</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>