What is the area of the rectangle in c㎡ if three squares with sides of 3 cm are put together to form a rectangle?
把三个边长都是3厘米的正方形拼成一个长方形，这个长方形的面积是多少c㎡
<gadget id="calculator">3 * 3 * 3</gadget>
<output>27</output>

<result>27</result>