2. When Little Careless calculated the sum of the interior angles of a certain convex polygon, he forgot to include one of the interior angles, and the result he got was 2022 degrees. The interior angle that Little Careless forgot is $\qquad$ degrees.
【Answer】138 degrees
【Analysis】The sum of the interior angles of a regular $n$-sided polygon is $(n-2) \times 180$. Since $180 \times 12=2160$, the missing interior angle is
$$
2160-2022=138 \text { degrees }
$$