A cylinder with a diameter of 10 cm is cut longitudinally along the diameter, and the surface area increases by 200 cm**2. What is the volume of the cylinder in cm**3?
一个直径10cm的圆柱，沿直径纵向剖开后，表面积增加了200cm**2，原来这个圆柱体的体积是多少cm**3？
<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>