If a cuboid is 2m long, 30cm wide and 30cm thick, if its length is cut into two sections, how much will the surface area increase?
一个长方体方木，长2m，宽和厚都是30cm，把它的长截成2段，表面积增加多少．
<gadget id="calculator">30 * 30 * 2</gadget>
<output>1_800</output>

<result>1_800</result>