A cylinder with a base radius of 3 cm and a height of 1 decimeter is divided into several parts along the diameter and assembled into an approximate cuboid. How many square centimeters does the surface area increase?
一个圆柱，底面半径为3厘米，高1分米，把它沿着直径平均分成若干份再拼成一个近似长方体．表面积增加多少平方厘米．
<gadget id="calculator">3 * 1 * 10 * 2</gadget>
<output>60</output>

<result>60</result>