Expand the sides of a cylinder to get a square. The perimeter of the square is 50.24 cm. What is the volume of the cylinder in cubic centimeters?
把一个圆柱体的侧面展开，得到一个正方形，已知正方形的周长是50.24厘米，那么圆柱体的体积是多少立方厘米．
<gadget id="calculator">3.14 * 4 * 6.28</gadget>
<output>78.8768</output>

<result>78.8768</result>