Cut a cylinder and assemble it into an approximate cuboid, the surface area increases by 6 square centimeters, the height of the cuboid is known to be 3 cm, find the volume of the cylinder.
将一个圆柱切开后拼成一个近似的长方体，表面积增加了6平方厘米，已知长方体的高为3厘米，求圆柱体的体积．
<gadget id="calculator">6 / 2 / 3</gadget>
<output>1</output>

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

<gadget id="calculator">3.14 * 1 * 3</gadget>
<output>9.42</output>

<result>9.42</result>