4. Suppose that $\overline{A2021B}$ is a six-digit integer divisible by $9$. Find the maximum possible value of $A \cdot B$.

5. In an arbitrary triangle, two distinct segments are drawn from each vertex to the opposite side. What is the minimum possible number of intersection points between these segments?

6. Suppose that $a$ and $b$ are positive integers such that $\frac{a}{b-20}$ and $\frac{b+21}{a}$ are positive integers. Find the maximum possible value of $a + b$.

### Problem 4
1. By the divisibility rule for 9, the sum of the digits of a number must be divisible by 9. Therefore, for the number $\overline{A2021B}$, we have:
   \[
   A + 2 + 0 + 2 + 1 + B \equiv 0 \pmod{9} \implies A + B + 5 \equiv 0 \pmod{9}
   \]
   Simplifying, we get:
   \[
   A + B \equiv 4 \pmod{9}
   \]

2. We need to find the values of $A$ and $B$ such that $A + B = 4$ or $A + B = 13$ (since these are the possible values that satisfy the congruence modulo 9).

3. For $A + B = 4$, the possible pairs $(A, B)$ are:
   \[
   (0, 4), (1, 3), (2, 2), (3, 1), (4, 0)
   \]
   The maximum product $A \cdot B$ in this case is:
   \[
   2 \cdot 2 = 4
   \]

4. For $A + B = 13$, the possible pairs $(A, B)$ are:
   \[
   (4, 9), (5, 8), (6, 7), (7, 6), (8, 5), (9, 4)
   \]
   The maximum product $A \cdot B$ in this case is:
   \[
   6 \cdot 7 = 42
   \]

5. Comparing the maximum products from both cases, we find that $42 > 4$. Therefore, the maximum possible value of $A \cdot B$ is:
   \[
   \boxed{42}
   \]

### Problem 5
1. Consider an arbitrary triangle with vertices $A$, $B$, and $C$. From each vertex, draw two distinct segments to the opposite side.

2. Each pair of segments from different vertices will intersect at least once inside the triangle. 

3. To minimize the number of intersection points, we need to consider the optimal arrangement of these segments. 

4. From vertex $A$, draw two segments to the opposite side. These two segments will intersect with the segments from vertex $B$ and $C$.

5. From vertex $B$, draw two segments to the opposite side. These segments will intersect with the segments from vertex $A$ and $C$.

6. From vertex $C$, draw two segments to the opposite side. These segments will intersect with the segments from vertex $A$ and $B$.

7. The minimum number of intersection points occurs when each new segment intersects with all previously drawn segments. This results in:
   \[
   \boxed{6}
   \]

### Problem 6
1. Given that $\frac{a}{b-20}$ and $\frac{b+21}{a}$ are positive integers, we can write:
   \[
   \frac{a}{b-20} \cdot \frac{b+21}{a} = \frac{b+21}{b-20} = 1 + \frac{41}{b-20} \in \mathbb{Z}
   \]
   This implies that $\frac{41}{b-20}$ must be an integer.

2. Since $b-20 > 0$, the possible values for $b-20$ are the divisors of 41. The divisors of 41 are 1 and 41. Therefore, we have:
   \[
   b - 20 = 1 \implies b = 21
   \]
   \[
   b - 20 = 41 \implies b = 61
   \]

3. For $b = 21$, we have:
   \[
   \frac{a}{21-20} = a \quad \text{and} \quad \frac{21+21}{a} = \frac{42}{a} \in \mathbb{Z}
   \]
   The maximum possible value of $a$ is 42. Therefore, $a + b = 21 + 42 = 63$.

4. For $b = 61$, we have:
   \[
   \frac{a}{61-20} = \frac{a}{41} \quad \text{and} \quad \frac{61+21}{a} = \frac{82}{a} \in \mathbb{Z}
   \]
   The possible values of $a$ are 41 and 82. The maximum possible value of $a$ is 82. Therefore, $a + b = 61 + 82 = 143$.

5. Comparing the maximum sums, we find that $143 > 63$. Therefore, the maximum possible value of $a + b$ is:
   \[
   \boxed{143}
   \]