If a cylindrical material is sawn into 6 sections, the surface area is increased by how many cross-sectional areas.
一个圆柱形材料，把它锯成6段，表面积增加了多少个横截面面积．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>