If a cylinder with a base area of 25cm**2 is sawn into three equal cylinders, by how much is its surface area increased?
把一个底面积是25cm**2的圆柱体锯成三个相等的圆柱体，它的表面积增加了多少．
<gadget id="calculator">25 * 4</gadget>
<output>100</output>

<result>100</result>