cylinder with a height of 10 cm is cut into two half cylinders along the diameter of the base to increase the surface area by 40 cm2. What is the volume of this cylinder in cubic centimeters?
把一个高10厘米的圆柱体沿底面直径切割成两个半圆柱体，表面积增加40平方厘米．这个圆柱体的体积是多少立方厘米．
<gadget id="calculator">40 / 2 / 10</gadget>
<output>2</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<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>