The diameter of the bottom of a cylinder is 4 cm, and the height is 6 cm. If the cylinder is divided into several equal parts and assembled into an approximate cuboid with the same base and height, how many square centimeters will its surface area increase?
一个圆柱底面直径是4厘米，高是6厘米，如果把这个圆柱平均分成若干等份，拼成一个和它等底等高的近似长方体，那么它的表面积增加多少平方厘米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 * 6 * 2</gadget>
<output>24</output>

<result>24</result>