Construct an angle of `90^(@)`, using ruler and compasses only.

Explanation

To construct a 90-degree angle using a ruler and compass, follow these steps:

### Step-by-Step Construction:

1. **Draw a Line Segment:**
- Use a ruler to draw a horizontal line segment \( AB \). This will be the base of your angle.

**Hint:** Ensure that the line segment is long enough to accommodate the angle you will construct.
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