Cut a cylinder along the diameter of its base to obtain two squares. The perimeter of each square is 80 cm. Find the volume of the original cylinder.
把一个圆柱沿它的底面直径切开，得到的截面是两个正方形，每个正方形的周长是80厘米，求原来圆柱的体积．
<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 20</gadget>
<output>6_280</output>

<result>6_280</result>