Cut a cylinder and assemble it into a cuboid. The length of the cuboid is 3.14 meters and the height is 2 meters. How much does the surface area increase?
把一个圆柱切开拼成一个长方体，长方体的长是3.14米，高是2米，表面积增加多少？
<gadget id="calculator">3.14 / 3.14</gadget>
<output>1</output>

<gadget id="calculator">1 * 2 * 2</gadget>
<output>4</output>

<result>4</result>