Select all of the options which are true of the perpendicular bisector of line $$ A B $$. $$ \begin{array}{l}\text { It is a fixed distance from line } A B \ \text { It meets line } A B \text { at } 90^{\circ} \quad \text { It passes through } A \ \text { It meets line } A B \text { at } 180^{\circ} \quad \text { It passes through } B\end{array} $$ It does not meet line $$ A B $$ It passes through the midpoint of line $$ A B $$

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To analyze the properties of the perpendicular bisector of line segment $$ AB $$, let's go through each statement one by one:

1. **It is a fixed distance from line $$ AB $$**: 
   - This statement is **false**. The perpendicular bisector is not a fixed distance from line $$ AB $$; rather, it is a line that is equidistant from the endpoints $$ A $$ and $$ B $$ but not from the line itself.

2. **It meets line $$ AB $$ at $$ 90^{\circ} $$**: 
   - This statement is **true**. By definition, the perpendicular bisector intersects line segment $$ AB $$ at a right angle (90 degrees).

3. **It passes through $$ A $$**: 
   - This statement is **false**. The perpendicular bisector does not pass through point $$ A $$; it passes through the midpoint of $$ AB $$.

4. **It meets line $$ AB $$ at $$ 180^{\circ} $$**: 
   - This statement is **false**. A line cannot meet another line at 180 degrees; this would imply they are collinear, which is not the case for a perpendicular bisector.

5. **It passes through $$ B $$**: 
   - This statement is **false**. Similar to point $$ A $$, the perpendicular bisector does not pass through point $$ B $$.

6. **It does not meet line $$ AB $$**: 
   - This statement is **false**. The perpendicular bisector does meet line $$ AB $$ at the midpoint.

7. **It passes through the midpoint of line $$ AB $$**: 
   - This statement is **true**. The perpendicular bisector is defined as the line that bisects $$ AB $$ at its midpoint.

### Summary of True Statements:
- It meets line $$ AB $$ at $$ 90^{\circ} $$.
- It passes through the midpoint of line $$ AB $$.

Thus, the true options are:
- It meets line $$ AB $$ at $$ 90^{\circ} $$.
- It passes through the midpoint of line $$ AB $$.
The perpendicular bisector of line $$ AB $$ meets $$ AB $$ at a right angle and passes through the midpoint of $$ AB $$.

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