After a cylinder with a diameter of 10 cm is cut longitudinally along the diameter, the surface area increases by 200 square centimeters. What is the volume of the cylinder in cubic centimeters?
把一个直径是10厘米的圆柱体沿直径纵切开以后，表面积增加了200平方厘米，原来这个圆柱的体积是多少立方厘米？
<gadget id="calculator">200 / 2 / 10 / 2</gadget>
<output>5</output>

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

<gadget id="calculator">200 / 2 / 10</gadget>
<output>10</output>

<gadget id="calculator">3.14 * 25 * 10</gadget>
<output>785</output>

<result>785</result>