Question: Use the Venn diagram shown to list the set $A$ in roster form.
1. **State the problem:** We need to list the elements of set $A$ from the given Venn diagram in roster form.
2. **Understand the Venn diagram:** The universal set is a rectangle containing three overlapping circles labeled $A$, $B$, and $C$.
3. **Identify elements in set $A$:** According to the problem, set $A$ includes the elements $3$, $4$, $5$, $6$, $10$, $11$, and $12$.
4. **Write set $A$ in roster form:** This means listing all elements explicitly inside curly braces.
5. **Final answer:**
$$A = \{3, 4, 5, 6, 10, 11, 12\}$$
This completes the listing of set $A$ in roster form.