The base of a cuboid is a square, the perimeter of its base is 12 decimeters, and its height is 9 decimeters. If its height is increased by 2 decimeters, what is the volume of the increased cuboid?
一个长方体的底面是正方形，它的底面周长是12分米，高是9分米，若将它的高增加2分米，则增加的长方体的体积是多少．
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">3 * 3 * 2</gadget>
<output>18</output>

<result>18</result>