If a cylinder of wood has a base area of 10 square centimeters, if it is cut into three equal small cylinders, how many square centimeters will the surface area increase?
一根圆柱体木料，它的底面积是10平方厘米，把它截成3根相等的小圆柱体，表面积增加了多少平方厘米．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">2 * 2 * 10</gadget>
<output>40</output>

<result>40</result>