A cylinder is vertically cut into several equal parts along its bottom surface, and assembled into an approximate cuboid with the same base and height, and the surface area is increased by 20 square centimeters. It is known that the height of this cylinder is 10 centimeters. Its What is the volume in cubic centimeters.
一个圆柱，沿着它的底面半给垂直切成若干等份，拼成一个与它等底等高的近似的长方体，表面积增加了20平方厘米，已知这个圆柱的高是10厘米，它的体积是多少立方厘米．
<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 10</gadget>
<output>31.4</output>

<result>31.4</result>