cylindrical wooden rod with a diameter of 8 cm is divided into two equal parts along the diameter, and the surface area increases by 240 cm**2. What is the original volume of the wooden rod in cm**3?
一根圆柱形木棒，直径是8cm，沿着直径分成相等的两块，表面积增加了240cm**2，原来木棒的体积是多少cm**3．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">240 / 2 / 8</gadget>
<output>15</output>

<gadget id="calculator">3.14 * 16 * 15</gadget>
<output>753.6</output>

<result>753.6</result>