&lt;!-- KEY CONFLICT: stored correct_index=327 (invalid), computed answer=324 --&gt;<br>
When unfolded, the paper is a full square.<br><br>
The side length of the square is 18 cm (from the folded figure).<br>
&bull; Area of the square = 18 × 18 = 324 cm&sup2;.<br><br>
Final Answer: 324 cm&sup2;