A cylinder 8 cm high and 2 cm in diameter at the base is cut perpendicularly along its diameter by how much its surface area increases.
一个圆柱体高8厘米，底面直径2厘米，沿着它的直径垂直切开，表面积增加了多少．
<gadget id="calculator">8 * 2 * 2</gadget>
<output>32</output>

<result>32</result>