A cylinder with a height of 10 decimeters is composed of two identical cylinders, and the surface area increases by 50.24 square decimeters after separation. What is the volume of a cylinder.
一个高10分米的圆柱由两个完全一样的圆柱拼成，分开后表面积增加了50.24平方分米．原来一个圆柱的体积是多少．
<gadget id="calculator">50.24 / 2</gadget>
<output>25.12</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

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

<result>125.6</result>