If a cylinder with a base diameter of 10 cm is cut along the diameter and the surface area increases by 160 cm2, what is the original volume of the cylinder?
底面直径为10厘米的圆柱形，如果沿直径切开，这时表面积增加160平方厘米，圆柱体原来的体积是多少？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">160 / 2 / 10</gadget>
<output>8</output>

<gadget id="calculator">3.14 * 25 * 8</gadget>
<output>628</output>

<result>628</result>