What is the area of a rectangle made of three rectangles whose length is 4 decimeters and whose width is 3 decimeters?
用三个长都是4分米，宽都是3分米的长方形拼成一个长方形，它的面积是多少平方分米．
<gadget id="calculator">4 * 3 * 3</gadget>
<output>36</output>

<result>36</result>