A cylinder with a height of 5 centimeters is cut into two parts and the surface area increases by 10 square centimeters. What is the original volume of the cylinder in cubic centimeters?
一个高5厘米的圆柱，横截成两段以后表面积增加10平方厘米，原来圆柱的体积是多少立方厘米．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<result>25</result>